I have the same problem trying to back up my system using Deja Dup. When
I try to run the app, I first get a message that I need to install
package gvfs-backends
When I try to install the package, I get 'Error while installing
package: installed python3 package post-installation script
I am also having these same issues with not being able to read any CD or
DVD. Like #23, I would really appreciate it if someone would provide a
step-by-step process that those of us who are less computer-literate can
understand and follow. Instructions using the terminal works for me.
--
You
Message 1
Third party sources disabled.
Some third party entries in your sources.list were disabled. You can re-enable
them after the upgrade with the 'software-properties' tool or your package
manager.
Message 2
Could not calculate the upgrade
An unresolvable problem occurred while calculating
