How to fix E: Broken packages (apt-listchanges) in APT

First, identify all broken packages on your system:

sudo apt-get check

This command will list which packages have dependency problems and need to be fixed.

Use dpkg to finish any incomplete package configurations:

sudo dpkg --configure -a

This will attempt to complete any partially installed or removed packages that dpkg left in an inconsistent state.

Update the package lists while ignoring temporarily unavailable packages:

sudo apt update --fix-missing

This allows apt to refresh its package cache while skipping any missing or broken sources.

Use apt to fix broken package dependencies:

sudo apt --fix-broken install

Alternatively, you can use:

sudo apt install -f

This command will install missing dependencies and attempt to resolve the broken state. You may be prompted to remove conflicting packages.

If the above steps do not resolve the issue, forcefully remove apt-listchanges and let apt reinstall it:

sudo dpkg --remove --force-remove-reinstreq apt-listchanges

Then reinstall and update:

sudo apt update && sudo apt install apt-listchanges

This forces removal even if dependencies are broken, then performs a clean reinstall.

Once apt-listchanges is fixed, complete any pending upgrades:

sudo apt update
sudo apt upgrade

Your system should now be able to process package operations normally.