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 -- 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 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs