I found a work around in ubuntu forum :
http://ubuntuforums.org/showthread.php?t=1735533
*** quote ***
To disable mnemonics you should create (if it doesn't already exist)
~/.gtkrc-2.0. This file should contain the line gtk-enable- mnemonics = 0
(you can add other GTK settings if you'd like).
Same bug in Ubuntu 14.04, it worked fine in 12.04.
It's really annoying that Ubuntu privates us from all the alt+key
shortcuts...
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https://bugs.launchpad.net/bugs/1113
