Mouse and keyboard input work normally with every other app (so far).
Launching mousepad app (/usr/bin/mousepad) results in a normal-looking window that won't accept input into the text area. I can click on and use the keyboard to operate the menu. Same effect if I right-click on a file and choose "open with".
This just started. AFAIK nothing has changed for a week or so.
I have uninstalled and re-installed (dpkg --purge mousepad) to no avail.
Any ideas welcome.
This is Xubuntu 18.04
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS" Linux nameHere 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
ADDED 2018-12-27 gnome-system-monitor (/usr/bin/gnome-system-monitor) is behaving the same way. In addition, the list in the "processes" section is greyed-out (besides being unresponsive to clicks).
ADDED 2019-01-19 well, not ready to do a fresh install of xubuntu to fix this, and atom was not cutting it for my simple needs, so I purged mousepad and installed leafpad. That seems to work OK so far. As a small note, I discovered I could paste into the edit area, but not type. The settings options were mostly not available, too. Booting the same hardware with an 18.04 rescue USB (full xubuntu install on a usb stick) results in normal mousepad behaviour.
I am also still stuck with gnome-system-monitor being useless, but it was just a bit more familiar than task-manager, so I canned gnome-system-monitor, too.
Wondering what else will come up and bite me. Next hardware failure is guaranteed to generate a fresh install.