Miscellaneous compatibility options → Enable extra typographic characters — solved my problem.
The question is: why 3rd level needs enable extra characters, but Compose need not? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448387 Title: 3rd level key chooser does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1448387/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
