Apparently no bug.
After creating a new user, the problem vanished.
xkb-data 1.6 and my kxkbrc configuration file conflicted.
Sorry for reporting!
** Changed in: xkeyboard-config (Ubuntu)
Status: New => Invalid
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after update to xkb-data_1.6-1 modifier keys (left and right ALT) dont work in
gtk apps anymore
https://bugs.launchpad.net/bugs/389836
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