Keyboard Ignored After Waking From Suspend In Xubuntu/XFCE

Every time after waking from suspend on my Lenovo ThinkPad laptop I would enter my password to unlock the session – but then the keyboard would not work (no input would go into the active window and even session shortcuts like alt-arrow would not work)… until I used the mouse to click on another window for it to gain focus. After that the keyboard would work fine.

I found the solution on this thread. It was as simple as running:

sudo apt-get remove light-locker

This was on Ubuntu 20.04 running XFCE (Xubuntu).