module issue?

I want to configure nat and I get this:

sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE -v
iptables v1.6.0: can't initialize iptables table `nat': Table does not
exist (do you need to insmod?) Perhaps iptables or your kernel needs to
be upgraded.

uname -r


ls -l /lib/modules
total 8
drwxr-xr-x 3 root root 4096 May 24 03:32 4.14.34+
drwxr-xr-x 3 root root 4096 May 24 03:32 4.14.34-v7+

I think I understand that /lib/modules will need to have an entry for
4.9.80+ but doesn't.
I've run sudo apt upgrade so I don't think that's a problem .But I
don't see how to proceed.

systemd-resolve/NetworkManager changes (17.10 -> 18.04)

Whenever I connect my laptop to a new network with NetworkManager, I
don't need to manually set the DNS servers if I configure
systemd-resolve with the following (in




The problem is that this stopped working when I upgraded from Artful to

$ systemd-resolve --status | awk '/DNS Servers/,/^$/'
DNS Servers:

But it works if I manually restart systemd-networkd and network-manager

Webcam videos - kamoso vs cheese

Hi All,

I tried using "kamoso" to record webcam videos. It was unusable. After
_much_ effort installing this or that library, I went to, it
recommended "cheese" instead.

Problems with install an XMPP ejabberd server with ubuntu 18.04


I'm trying install an XMPP ejabberd server with ubuntu 18.04 and I've
problems with it. Everything seems to be ok, but when I try enter inside
the admin configuration in FireFox don't work.

Could you help me to resolve or to find the error?


Is a simple method of blocking a particular domain name or IP address set available


I am running UbuntuMATE 16.04.

Continuous Internet traffic is shown to be occurring.

Etherape shows it to involve a single domain name ( and its
IP address set (

I have tried to add a rule to deny it, using the Ubuntu firewall
software available through the Control Centre, but it requires, and,
limits each rule to, a single port number (which I do not know how to
find, for the traffic).

Is a simple method of blocking a particular domain name or IP address
set available, so that I can deny access to this domain name and/or
its IP address set?

Searching for

Is there any way to configure the options that Network Manager sends to dhclient?

I'm running xubuntu 17.10 on my laptop (soon to be 18.04) and use the
default Network Manager to handle network connections.

I have a need to change the dhclient settings which are set by Network
Manager which calls dhclient:-

chris$ ps -ef | grep dhclient
root 7586 1585 0 09:00 ?

Printer problem

After upgrading to 18.04 I am no longer able to install my printer.

With 17.10 I had a Canon MX920 operating as a network printer. However
the upgrade has removed this and I am now prevented from installing the

The printer and its IP address are detected, but after doing its search
for drivers, the setup program gives a cups server error:

I have tried re-installing Cups, but to no effect.

openSUSE conference 2018: fancy a weekend away in Prague?

The programme for this year's openSUSE conference has been published.

<a href="" title=""></a>

It's in Prague, Czechia, the last weekend of this month. The event is free
and Prague is surprisingly cheap -- beer is £1.50 a pint and unlimited
public transport is £3 a day.

<a href="" title=""></a>

And there will be at least one Ubuntu user there... that is, me. :-)

Apologies if anyone is upset by the spam. Merely plugging it 'cos I work
for them and live here in Prague. There's nothing else in this for me

I will shut up now.

Kworkers, Kworkers


Again, those pesky kworker threads are taking over my machine. Right now, I'm having 45 of those. The hard disk is working all the time, but this doesn't slow down the system. Probably because I also have an SSD.

Does anyone know, what this is about? Is it a known (kernel) bug? Should I worry? How to get rid of those things ...?


How to empty trash?

Being a fairly new user to Linux/Ubuntu I did a stupid thing and do not know
how to get out of it. I have a new laptop that I am trying to set up as a
replacement of an old laptop. I copied a my home directory from a desktop that
had an upgrade fail to the new laptop as backup before trying to recover the
desktop. I did not check the amount of space needed and the laptop did not
have enough space so the /home partition ran out of space. I thought no
problem I would just get rid of the data I just copied.

Ubuntu 18.04 - GNOME - Desktop icon conflict


I was testing/using Ubuntu 18.04 when I noticed something odd. I had a few
files on the desktop. I plugged in a USB flash drive and an icon for the
drive appeared on the desktop, That is ok _except_ that the icon was placed
over some existing icons.

I've had a quick look on and not found anything. Has
this bug been reported before or shall I file a new bug report?

Thank :)


mythtv package developers for Ubuntu packages


From posts on the mythtv mailing list, an inconsistency between the
general mythtv software and the mythtv packages for Ubuntu, appears to
have been advised, about which, I am advised, I should ruise a bug
notification with the package developers.

However, in the Ubuntu Software Centre information displayed about
mythtv, the "Developers website" link points to

So, I am wondering whether the developers of the mythtv packages for
Ubuntu, happen to be subscribed to, and, involved in, this list?

Re: Difficulties with trying to install and use tv adaptor

On 13/05/2018, Bret Busby <bret. ... at gmail dot com> wrote:

Difficul;ties with trying to install and use tv adaptor


I have purchased and tried to install, a tv adaptor;
AVerMedia A867R AVerTV Volar HD Nano USB TV Tuner
for PAL digital television in Austyralia, on UbuntuMATE 16.04.x

I have tried to do it on two separate computers.

I tried to inslall MythTV, which would not install from the Ubuntu
Software Centre, because it wants to get rid of MySQL, also tried to
install MeTV and TVTime.

Amongst other problems, apparently, the tv device is not detected.

Ins earching to find whether Linux drivers are available for the
device (the advertisements showed that it should work with Linux, and,

Ubuntu 14.04's Debmirror broken?

I have been using debmirror (1:2.16ubuntu1.1) on an Ubuntu 14.04 server to
maintain a local mirror of Ubuntu 14.04, but in the past week it is failing:

Use of uninitialized value $l in chop at /usr/share/perl5/LockFile/ line 438.
Use of uninitialized value $l in string eq at /usr/share/perl5/LockFile/ line 439.
Use of uninitialized value $stamp in chop at /usr/share/perl5/LockFile/ line 570.
Use of uninitialized value $stamp in pattern match (m//) at /usr/share/perl5/LockFile/ line 576.
Use of uninitialized value $hostname in string ne at /usr/share/perl5/

SSLv3/OpenSSL/Apache2/Ubuntu error


I am trying to use Apache2 on Ubuntu 16. When I try running Apache2, it
throws up an error:

SSLv3 not supported by this version of OpenSSL. I tried installing latest
version of OpenSSL by using (sudo apt-get install openssl) on Ubuntu.
However the same error persist.

Any idea how do I resolve the error?

Thank You

"The greatness of a nation can be judged by the way its animals are

Silly me... I think I may have succumbed to a possible phishing email...

I clicked on a link inside what I thought was a follow-up email sent to me
about a job application. If you want to know what the link was, you'll find
it here <>. I don't recommend
clicking it, because I don't know what it does; I supplied it merely in
case someone could inspect the link and advise. I tried to reply to the
sender and apparently the recipient's email server cannot be contacted.

Now, it appears that a whole swag of downloads are failing when I try to
connect to get patches.

Need name of firefox feature

In firefox 59 there was a feature that displayed icons for your 10 most
visited sites in each new tab you opened. After I upgraded to firefox 60
they no longer display.

What was that feature called? So I can try to get it working again.

Thanks, Jim

trackpad issues in Ubuntu 18.04? (NOT new click behavior)

I upgraded my Macbook Pro II from Ubuntu 17.10 to 18.04 (not reload
from scratch). This is a native install of Ubuntu (dual boot with
MacOS). Ubuntu 17.10 had no issues at all. For 18.04 things seem
mostly fine except for one fairly infuriating problem: my trackpad now
"freezes" while I'm dragging it.

If I move the cursor around (dragging with one finger) at some point
(sometimes almost immediately, sometimes after a few seconds) it will
freeze in place and won't move anymore, until I pick up my finger and
put it back down again.

interrupted do-release-upgrade

Hello all,

I was running 'do-release-upgrade' (in a terminal window) to upgrade my 17.10
system to 18.04. The download phase had finished, the install phase was in
progress (I think) and I was responding to a debconf prompt about a modified
config file when I accidentally hit ^C and interrupted it.

Some googling suggested the upgrade might be running in a 'screen' process
but 'screen --list' reports screen is not installed.
Rerunning the do-release-upgrade command says no new release found.

How to do a bulk download of password-protected data?

I've had to do this manually many times. If it weren't for the
password-protection, it would be easy with wget or rsync. As it is, I have
to log in to whatever site contains the data with my web browser, then
click on each and every one of what is sometimes over one hundred different

I understand that wget has some capability of sending cookies, and that
that's how password-related credentials are presented, but I do not know
how to set it up. Are there any howto's youtubes, or the like about this?

++ kevin

Should dhclient be running all the time?

I have a laptop running Ubuntu 17.10 (well, actually xubuntu but that
makes little difference to this) and I have a problem with dhcp.

The problem occurs when I move the laptop around and have to change
from one router's WiFi to another (we have quite a big house). What
happens is that dhcp seems to fail when connecting to the new router
and the WiFi on the laptop has no IP, DNS or default route. I do the
change manually using the Network Manager applet, i.e.

System not responsive doing an upgrate to 18.04

This morning the system poped up a update window. I did the update and then
got the message to upgrade to 18.04 which I allowed. Since it takes hours to
upgrade I went to do other things. When I returned to the computer the upgrade
was only about two thirds the way to completion and not responding to the
keyboard or mouse. When I started the upgrade the computer was on the LAN and
working, Now if this computer is plugged into the LAN none of the other
computers can access the network.

How to check kernel "livepatch" version?


Regarding LSN-0037-1, posted to ubuntu-security last week: how does one
verify that they are running a properly patched kernel? All of my apt-based
tools refer to the kernel version as, for example,, but the
security announcement refers to a "livepatch version" ...

Workspaces on 18.04 LTS


In 16.04 I had a 2x2 matrix of 4 workspaces and it was really useful.

In 18.04 I now have a 3x1 matrix of 3 workspaces and it isn't as good. Is
there a way to adjust this to behave like 16.04?

Oh, and I'm going to file a bug report re: 18.04's handling of my HP
LaserJet printer.



Update to python3.6 breaks pip

This happened to me on a system running Mint 18. I received an update to
python 3.6 the other day.

CD wont play properly

My wife got me a few movies from Netfilx. They play fine.
Then she got me a tv series that Im watching - you can only
hear thebackground music and sound effects. You can just
barely hear the dialog. I use VLC though Ive tried a few others.
They play on VLC on my wifes Windows computer (unfortunately).
Any suggestions to things I can try?


Window Share Problem

Hi All,

I mounted a windows share using

// /media/ezproxy cifs credentials=/root/yyy,iocharset=utf8,sec=ntlm 0 0

in /etc/fstab/

I works well, I can read the files in media/ezproxy.

There is no process running on this share, I am not reading or writing any data there.

Now, after a while the server the simply breaks down because of too much memory and cpu usage. I am definitely sure it is only this mount crashing the server.

I am running a 16.04 LTS Ubuntu Server on a hyper-v VM, which I upgraded from 14.04 LTS.

Does anyone have any idea what the reason may be?


I am running MINT 18.3 on an AMD 64 bit processor. I want to control
and read data from my Siglent Spectrun Analyzer with my computer through
its USB port. How do I accomplish this with the C program language? I
have googled for an answer but haven't found an answer that I
understand. Is there a 'usb-open' function that will allow use of the
traditional character and string functions?

Thanks for any suggestions.


Default position of document icons on screen


I would like to change the default position on the screen of new
documents or downloaded documents (Ubuntu 18.04), which at present is
the top left-hand corner. Is there any way of doing this?

Many thanks.

Gesendet von Mail für Windows 10

Protecting a file from accidentally being sent.


I regularly apply for jobs, and regularly see where the advertiser asks for
a CV in the form of a file, does not place a restriction on the type of
file it is asking for. The file selection window opens, and I can select
any file from my desktop (the place where I keep my CV as well as other
files - ones I definitely don't want to send).

i don't think I have ever sent a file I definitely don't want to send, but
sometimes I have had to catch myself before I did.

ThreadStack Project: a new innovative open source software for multi-thread computing

I have developed a new open source software as a result of a scientific
research and I want to share my study with scientists and/or software

ThreadStack is an innovative software which produces a class library for
C++ multi-thread programming and the outcome of the ThreadStack acts as an
autonomous management system for the thread synchronization tasks.
ThreadStack has a nice and useful graphical user interface and includes a
short tutorial and code examples.

Generating a new ubuntu-keyring .deb to sign CD


Trying to follow this guide to create a custom 16.04 install CD:
<a href="" title=""></a>

When trying to generate a new ubuntu-keyring, I keep running into this
dpkg-buildpackage -rfakeroot -m"Name <email>" -kA5E86765
dpkg-buildpackage: source package ubuntu-keyring
dpkg-buildpackage: source version 2012.05.19-1
dpkg-buildpackage: source distribution unstable
dpkg-buildpackage: host architecture amd64
dpkg-source --before-build ubuntu-keyring-2012.05.19
fakeroot debian/rules clean
dh clean

18.04 networking

I'm installing 18.04 on a server and added a static ip to the file
/etc/network/interfaces. It works and uses the address I assigned, but
its not respecting the 'dns-nameserver' line, and the system cant reach
the web.

has the dns-nameserver directive changed now?

Blatant self-plug, and a question

Because I thought it might be of some interest...

After my rant about GNOME made it onto HackerNews, I've written a brief
follow-up with a few tweaks that IMHO make the new GNOME-based 18.04 a bit
more bearable.

<a href="" title=""></a>

Is there any progress on an unofficial Unity remix? The only one I can find
for 18.04 hasn't updated since February.

I'm considering rolling my own.

On which note, is there any way to upgrade an existing 16.04 install and
*not* get GNOME?

apt-get not updating GUI packages?


I run Ubuntu 16.04 as a Dovecot mailserver and to keep the system
patched am religiously using ssh to sign into the machine and run both
of the following commands:
$ sudo apt-get update
$ sudo apt-get upgrade with an occasional $ sudo apt autoremove

On both previous incidents where I was told after signing in that there
were updates available, I ran the above commands.
Afterwards I reboot the machine using sudo and then sign-in again via
SSH to check if more updates are available.

Below is a screen paste
Welcome to Ubuntu 16.04.4 LTS (GNU/Linux 4.4.0-121-generic x86_64)


Long pause duign apt updates

Why is there always a loooooong pause (at leasta minute, maybe more) at
THIS exact stage of any apt or apt-get upgrade:

Processing triggers for shared-mime-info (1.5-2ubuntu0.1) ...
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'

Is there something going on that need fixing? This has been happening on
everything from 16.04 onwards, and it happens on Ubuntu-based systems
like Mint as well.


Really strange glitch with Ubuntu 16.04.4 LTS 64-bit


I hope this is the right place for this kind of message. If it isn't, I
apologise and ask you to direct me to the appropriate mailing list.

I'm running it on a lenovo ThinkPad T420 laptop and have been for years.

Kernel info: Linux turing 4.4.0-121-generic #145-Ubuntu SMP Fri Apr 13
13:47:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Just before logging in, I saw this unexpected error message:
"The system is running in low-graphics mode. Your screen, graphics card,,
and input device settings could not be detected correctly.

gufw error

I got the following error when I run gufw. Does anybody know how to
fix the problem?

$ gufw
Traceback (most recent call last):
File "/usr/share/gufw/gufw/", line 21, in <module>
from view.gufw import Gufw
File "/usr/share/gufw/gufw/view/", line 19, in <module>
from gi.repository import Gtk, Gdk, WebKit
ImportError: No module named repository
$ uname -a
Linux caph 3.13.0-143-generic #192-Ubuntu SMP Tue Feb 27 10:45:36 UTC
2018 x86_64 GNU/Linux

Data Loss

Hi all. While I was making a boot usb key using ubuntu xenial, don't
know what happened, but the default program erased my external hd
toshiba 1T. I'm rather sure that I did not tell the program to work upon
it, but anyway this is not the question. I tried to recover the data
inside the hd using Gparted, Testdisk and Photorec, but the only
opportunity they give me is to copy an image of the hd.

Linux substitute for Dreamweaver

Hello all:

I have a friend that is trying to convert all of his computing over to
Ubuntu based Linux. A major holdup is that he maintains several WEB
sites on a volunteer basis. He is using Dreamweaver for this purpose
and hasn't been able to find a Linux based alternate. What can I tell
him to do?



Run tracker reset without display - dbus error

I am using tracker [1] and trying to run

tracker reset -f ~/

However, I am running it in a situation where there is no display
(from a node-red exec node). I get the error

Tracker-WARNING **: Failed to load SPARQL backend: Cannot autolaunch
D-Bus without X11 $DISPLAY

Is there some magic I can perform to allow this to work?


[1] <a href="" title=""></a>

no access to wifi after updating dualboot on HP250 G5 NB

Hi there,

I have install 16.04 LTS some month ago on a HP 250 G5 notebook.

Everything worked fine, but the dualboot was clumsy, as the user had to go into
the bios each time booting the laptop to define what OS to boot.

So i used bootrepair to set up the grub such, that the user gets a grub screen
to select the OS to boot from.

It was quiet some shuffling till I had all obstacles regarding UEFI restriction.
But not the dualboot works as expected.

However, the LAN, bot wired and wifi behaves strangely.

1. WIFI: I can not find any WIFI interface.

launchpad... how to add a backport dependency to a PPA.

Hi folks,

I have a package: <a href="" title=""></a>
that I have a recipe that auto builds it for 18.04, but it depends on a version
of a package where the distro version is too old in older releases.

<a href="" title=""></a>

So I would like for the PPA to build & contain a back-ported version
of the dependency.

librabbitmq > 0.8.0

Do I create a project librabbitmq0_8 ?

email security?

I run thunderbird on various flavors of Ubuntu in text mode.

Is there any risk in just opening a suspicious email using thunderbird
in Ubuntu?

If there is risk does using text mode mitigate it any?

Would opening it in print preview make it less risky?

Regards, Jim

OT?: break up an incoming data stream into fixed length lines? in bash?

I'm using U16.04 to read data from a sensor. The incoming serial data
stream has no newlines, just continuous bytes. In the datastream the
letters B and M occur together at the start of every 24 byte
subsequence. I'm reading the data using getserial with appropriate
speed and parity parms. I don't see a simple way to break it up into
lines with each line having 24 bytes. Does anyone care to suggest a
method? I'd use a bash function if there is one.



Installing vmware player to the latest Ubuntu

Dear community,

I need a technical support. Because I am using Ubuntu Mate with Screen
reader, I want to use Vmware workstation player, Virtualbox
accessibility isn't good at this time. I reat:
<a href="" title=""></a>

but after an installation, I get error in kernel update, can't start
services. I am using Ubuntu Mate 18.04 Beta 1 and 16.04 and the same
error. In the .log file, the last message is can't execute build
commands. Am I doing something wronk?


Pavel Vlček

Adding a stream to XMMS2

I've decided to resurrect GKrellm on my Ubuntu 16.04 box as I liked the
various options for monitoring and other things it does. I installed
the GKrellmms plug-in as when previously running it (when it used XMMS)
I liked the option of streaming live audio with it. Now however I'm
having a problem getting that to work with XMMS2. I want to stream from
this site - <a href="" title=""></a> I've saved one of
the stream URLs as live.pls.

wrong icon

Running 16.04 fully updated. A while back I had a problem where
programs would "disappear" when minimized. At that time I got a number
of good suggestions and workarounds on this list that made it mostly
work correctly. Thank you all again. Since then I have seen something
else that made it look like they disappeared. What happens is that,
when minimized, they are associated with an icon on the left vertical
column that has NO RELATIONSHIP to the running program. The small white
triangle does appear on that icon, and when clicked brings back the
minimized program.

Re: What is the universal (world wide) understanding behind degaussing hard disks?

03 April 2018 at 19:09, David Fletcher wrote:
Re: What is the universal (world wi (at least in part)

Whats wrong with Thermite, easy to make and the heat will far excede the Curie
temperature of any disk plater material, not to mention melting it

Gwrite/Wordpad equivalent?

Of course, Ubuntu comes with text editors and word processors -- the
former can be extremely lightweight (or not), and the latter is
generally extremely heavyweight. There used to be an app in the middle,
though -- the Wordpad equivalent, for Linux. Pretty sure it was Gwrite,
which seems to have ceased development in '11 or so.

Nutshell: looking for a stupid lightweight word processor. Don't care
if it opens .DOC files. Don't care if it publishes to .HTML.

What is the universal (world wide) understanding behind degaussing harddisks?

Good evening from Singapore!

The foremost question which I want to ask is, what is the universal
(world wide) understanding behind degaussing hard drives?

I work for No Secrets Agency (NSA) Pte Ltd (fictitious company name

GLV does reduce performance loss of aged RAM

"While most issues with computers slowing down are well known, and
pretty much a solved problem. There is one that is only slowly becoming
noticeable as systems get progressively faster.

This is the problem of memory slowing down as it ages."

For more information read
<a href="" title=""></a> .

To work around this issue, it's possible to use GLV.

Search for utility to identify source of WWW traffic


I currently have two web browsers open (not firefox), and their
download managers show no downloads occurring.

But, something has beeen downloading data at around 200-300kBps, for
over an hour.

Is a utility available, that can identify what application(s) is/are
downloading data, and, what URL's are being accessed for the downloads
being performed?

Thank you in anticipation.

Weird systemd resolv.conf behavior


I've been having a strange problem with the systemd resolver on my
work laptop. Basically, whenever I use it at the office, a "search"
line with the work domain is added to this file

/etc/resolv.conf -> ../run/resolvconf/resolv.conf

and it stays there after I suspend the laptop, carry it home, & wake
it up to use the wired or wifi home network. The effect is that it's
impossible to resolve work hostnames.

Keybinding FUBARness.

Hi! I run MATE with Compiz, and love-love-love it... except for
something that's happened very recently. I use the
<alt><left-mouse-button> keybinding for window movement; it's now second
nature, and is on all my systems. Greatest thing since sliced bread;
don't have to even think about finding the dragbar, just drag the whole
darn window. Yay.

But, suddenly, it just stopped working on my primary work system.

apt update messed up after crash

Hi there,

during a manual apt update on a remote box, the terminal crashed.

No I can not run apt upgrade animore.

This is what I get when issuing

apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade...

Zoom H6 Audio recorder/interface


Does anyone knows if the Zoom H6 recorder works with Ubuntu/Linux as
audio interface? I intend to buy one if it works.

Thanks in advance!


INFO: task gnome-shell:5523 blocked for more than 120 seconds

I've noticed that my system will suddenly seem to 'lock-up'. I'd be
unable to switch windows and even the clock would freeze. I looked at
yesterday's kern.log.1 and saw this -
nG35/ Kernel info is:

uname -a
Linux localhost 4.13.0-37-generic #42~16.04.1-Ubuntu SMP Wed Mar 7
16:03:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I've found several instances of this via Google searches however none
really show a fix that I can see. 

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