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Consequences of removing venv

My Linux mint18 system recently wanted to up date python 3.6. When I
clicked install I got the following message:

The following 2 packages will be removed:
python3-dev
python3-venv

I have 2 virtual environments installed: python 3.5.2 & 3.6.7.

Listing the various pythons I have installed shows:

jfb@jims-mint18 ~ $ ls -ls /usr/bin/python*
0 lrwxrwxrwx 1 root root 9 Nov 23 2017 /usr/bin/python ->
python2.7
0 lrwxrwxrwx 1 root root 9 Nov 23 2017 /usr/bin/python2 ->
python2.7
3412 -rwxr-xr-x 1 root root 3492656 Nov 12 13:46 /usr/bin/python2.7
0 lrwxrwxrwx 1 root root 9 Jan 9 2017 /usr/bin/python3 ->
python3.5
4360 -rwxr-xr-x 2 root root 4464368 Nov 12 10:27 /usr/bin/python3.5
0 lrwxrwxrwx 1 root root 33 Nov 12 10:27
/usr/bin/python3.5-config -> x86_64-linux-gnu-python3.5-config
4360 -rwxr-xr-x 2 root root 4464368 Nov 12 10:27 /usr/bin/python3.5m
0 lrwxrwxrwx 1 root root 34 Nov 12 10:27
/usr/bin/python3.5m-config -> x86_64-linux-gnu-python3.5m-config
4500 -rwxr-xr-x 2 root root 4604416 Oct 25 2018 /usr/bin/python3.6
0 lrwxrwxrwx 1 root root 33 Oct 25 2018
/usr/bin/python3.6-config -> x86_64-linux-gnu-python3.6-config
4500 -rwxr-xr-x 2 root root 4604416 Oct 25 2018 /usr/bin/python3.6m
0 lrwxrwxrwx 1 root root 34 Oct 25 2018
/usr/bin/python3.6m-config -> x86_64-linux-gnu-python3.6m-config
0 lrwxrwxrwx 1 root root 16 Mar 23 2016
/usr/bin/python3-config -> python3.5-config
0 lrwxrwxrwx 1 root root 10 Jan 9 2017 /usr/bin/python3m ->
python3.5m
0 lrwxrwxrwx 1 root root 17 Mar 23 2016
/usr/bin/python3m-config -> python3.5m-config

So will allowing the update harm my virtual environments?

I really don't want to reinstall them.

thanks, Jim