Since three days, when I try to run the update manager or update with
sudo apt upgrade
I get this error:
E: Clearsigned file '/var/lib/apt/lists/ppa.launchpad.net_zorinos_apps_ubuntu_dists_focal_InRelease' contains unsigned lines. E: The package lists or status file could not be parsed or opened.
and on system start I get an error icon in the task bar showing me the error message and telling me to
run Package Manager from the right-click menu or
apt-getin a terminal to see what is wrong
This usually means that your installed dependencies have unmet dependencies
But when I try to run the update manager nothing happens and
apt-get doesn't tell me more.
What should I do?