The underlying issue (with the PPA) might be that the hud shortcut is actually set to <Alt> by default, which is eating the Alt_R modifier. You'll probably have to do:
gsettings set org.compiz.integrated show-hud "['Alt_L']"
Then Alt_R should work for modifier switching...
The underlying issue (with the PPA) might be that the hud shortcut is actually set to <Alt> by default, which is eating the Alt_R modifier. You'll probably have to do:
gsettings set org.compiz. integrated show-hud "['Alt_L']"
Then Alt_R should work for modifier switching...