Ubuntu – Broken package error after updating

I think I found a solution, but a big caveat though: it works, but I can’t explain why.

First, I went to /var/lib/dpkg/info/:

cd /var/lib/dpkg/info/

Then, I removed the lines pertaining to the packages which caused the problems. In my case, I had to do:

sudo rm -r python3-apparmor-click.*
sudo rm -r click-apparmor.*
sudo rm -r click.*
sudo rm -r ubuntu-app-launch.* 
sudo rm -r url-dispatcher-tools.*
sudo rm -r url-dispatcher:amd64.*
sudo rm -r libunity-scopes1.0:amd64

After that, I typed:

sudo apt purge python3-apparmor-click
sudo apt purge click-apparmor    
sudo apt purge click
sudo apt purge ubuntu-app-launch
sudo apt purge url-dispatcher-tools
sudo apt purge url-dispatcher:amd64
sudo apt purge libunity-scopes1.0

After that,

sudo apt update

And finally,

sudo apt dist-upgrade

which worked and updated my packages. All the packages problems seem to have disappeared.

As this error message Software index is broken. This is a major failure of your software management system. suggests, there is a major failure of your software management system comprised of several different errors, and these errors need to be individually repaired one error at a time in order to restore your package management to working condition.

Open the terminal and type:

sudo rm -vf /var/lib/apt/lists/*  
sudo add-apt-repository --remove ppa:pinta-maintainers/pinta-stable
sudo apt update
sudo apt install -f