error while loading shared libraries: libgtk-3.so.0

Solution 1:

It seems that problems are only happen with Snap'ed applications. Without gtk3 libraries you would not be able even to login to GUI session.

So I would suggest to save its list with

snap list

Then purge all of them by

sudo apt-get purge snapd

And install two problematic applications from deb-packages with

sudo apt-get install gnome-logs gnome-calculator

Optionally you can install Snappy back with sudo apt-get install snapd and reinstall (some of) snaps back then.