when I try to update and type:
sudo apt-get update
I get this error
E: Problem executing scripts APT::Update::Post-Invoke-Success 'test -x /usr/bin/apt-show-versions || exit 0 ; apt-show-versions -i' E: Sub-process returned an error code
That sounds like a bug in
If you don't know if you need it you quite likely don't need it.
If you need the program you could at least remove the file
and file a bug report.
I have to say I'm a beginner of Ubuntu but try to follow this guide:
Antonio says that it worked! Let's hope it will work for you too, even though the problem maybe isn't the same!