I am running Debian with Cinnamon and I use CTRL-Pageup/Pagedown all the time for nearly all apps that I use. I restarted my computer last week and it just suddenly stopped working. It doesn't work anymore for any apps (Terminal, Firefox, Chrome, etc.). The buttons still work, I can still use Pageup/Pageup to jump down or up or and the CTRL button still works. I looked into the settings and I don't see a command for this but it has worked for weeks and now all of a sudden it doesn't work. I tried to make a custom shortcut for it but it is asking for a file and I'm not sure what to do there.
Any insight is greatly appreciated!