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. Any suggestions?

Strangely, I am able to print from Libre Office, even though no printer
appears to be installed, but I cannot print from other programs (e.g.