Hello,
today I attempted an upgrade from 23.10 to 24.04d. One of the things I noticed is that the hellenic (greek) language was completely removed from my system meaning that I couldn't switch to it, yet under settings->keyboard->input sources it was there. I removed it and add it back again and things are working as normal.
In the meantime in order to restore the Alt+Shift keystroke language change instead of using Super+Space I had to issue the commands:
Code:
gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Shift>Alt_L']"
gsettings set org.gnome.desktop.wm.keybindings switch-input-source-backward "['<Alt>Shift_L']"
Regards!