Problem with updating zorin packages

[apollo79]

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-get in a terminal to see what is wrong

and that

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?

[Turtle11]

What happens if you run

sudo apt --fix-broken install

It might also be that the mirrors are set to the wrong region (check in Software Updater > Settings > Zorin Software)

[Luca_Pavan]

In my case, I ignore this error since it happens only when my time and date change much due to a persistent error and disappear once I restart the laptop or time and date are correct.

[Aravisian]

Can you open terminal and run

sudo rm -r /var/lib/apt/lists/*

sudo apt update