PackageKit daemon has crashed
 

I am running Kubuntu 20.04, 64bit, KDE Plasma 5.18.5

The application to look for updates gives no result, and I got a message "PackageKit daemon has crashed"

If I run Synaptic package manager, it exits while checking for package data

If I run Muon, it exits without doing nothing.

Never happened before.

I need some help.

By the way, I already tried
sudo dpkg --configure -a
without any result.
It's like dpkg does not run at all