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.)
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https://bugs.launchpad.net/bugs/2056578
Title:
Tor Browser - keyboard not functioning
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