the xubuntu 18.04 mouse and keyboard do not work with the mousepad, and only the mousepad

Keyboard and mouse input works normally with all other applications.

Launching the mousepad application (/ usr / bin / mousepad) creates a normal looking window that does not accept entries in the text box. I can click and use the keyboard to use the menu. Same effect if I right-click on a file and choose "Open with".

This has just begun. As far as I know, nothing has changed for a week or so.

I have uninstalled and reinstalled (dpkg –purge mousepad) to no avail.

Every idea is welcomed.

That's Xubuntu 18.04

DISTRIB_DESCRIPTION = "Ubuntu 18.04.1 LTS"
Linux nameHere 4.15.0-43-generic # 46-Ubuntu SMP Thu 6 Dec 14:45:28 UTC 2018 x86_64 x86_64 x86_64 GNU / Linux