I have found the real reason and fix for this issue! It seems that it is caused by no permissions for ~/.cache/ibus/dbus-* socket. But for some weird reason, the issue happens only if abstractions/dbus-session is included in the torbrowser.Browser.firefox AppArmor profile file.
Adding this line into torbrowser.Browser.firefox seems to fix the issue without any side effects: owner @{HOME}/.cache/ibus/dbus-* rw, (This line is also present in the official Firefox AppArmor profile, but missing from the torbrowser-launcher one.) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2056578 Title: Tor Browser - keyboard not functioning To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/torbrowser-launcher/+bug/2056578/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs