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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). Then, restart for the changes to take effect (you may be able to log out then log in instead).
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I don't know what are mnemonics, and it might depends on which version of gtk your application is using.
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). Then, restart for the changes to take effect (you may be able to log out then log in instead).
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I don't know what are mnemonics, and it might depends on which version of gtk your application is using.