I have upgraded my Ubuntu (from anno dazumal) to 14.10 and lost the standard behaviour of ALT-key of my old account. The left ALT are now a ISO_Level3_Shift.
A new made account have a correct ALT-key.
1) I have tried to find what (old) config file that results in this change of keyboard configuration. I removed almost all .-files and files in .config I could find. (no luck)
2) I have reconfigured the keyboard using xmodmap and a local ~/.xmodmap-file.
keycode 92 = Alt_L Meta_L Alt_L Meta_L
Gives me an ALT that can activate HUD but combinations with other keys does not work such ALT+TAB, CTRL+ALT+LEFT etc
I would prefer to find and remove the configuration that destroys my ALT-key (1) rather than add a new configuration that alter the wrongful configuration (2).