Ibus input methods other than default don't work

[sr258]

I'm trying to enter Chinese characters with ibus-libpinyin in Anki, but anki-ppd only seems to accept the default keyboard layout (German in my case). If I switch the input method to Chinese and type I still get the German keyboard layout. It also doesn't work if I start Anki with the Chinese layout already selected.

I can switch keyboard layouts in the Anki apt package from Ubuntu Universe (2.1.15+dfsg) and also in most other snaps (like Firefox, Insomnia, Lumi, Slack)._ There are a few snaps that don't work (VS Code).

I've done a bit of research and I believe that it's necessary to add some library to enable IBUS in Snaps: https://forum.snapcraft.io/t/cant-use-input-method-in-snap-apps/4712 (The thread is concerned with GTK 3, but I think the general issue is applicable to QT 5 as well). They mention the required libraries for GTK in the thread, but not for QT5.

It might also be a security violation issue, as suggested here: https://forum.snapcraft.io/t/ibus-input-method-not-available-in-qt5-applications/11712

However, the logs don't show any violations that are connected with IBUS, I think:

sudo journalctl --follow | grep audit
Nov 02 08:17:53 ubuntu-2204 audit[12452]: AVC apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/etc/" pid=12452 comm="python3" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1400 audit(1667373473.364:397): apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/etc/" pid=12452 comm="python3" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 audit[12452]: SECCOMP auid=1000 uid=1000 gid=1000 ses=3 subj=? pid=12452 comm="python3" exe="/usr/bin/python3.10" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7ff9443d55b1 code=0x50000
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1326 audit(1667373473.508:398): auid=1000 uid=1000 gid=1000 ses=3 subj=? pid=12452 comm="python3" exe="/usr/bin/python3.10" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7ff9443d55b1 code=0x50000
Nov 02 08:17:53 ubuntu-2204 audit[12452]: AVC apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/zoneinfo64.res" pid=12452 comm="python3" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 audit[12452]: AVC apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=12452 comm="python3" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1400 audit(1667373473.592:399): apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/zoneinfo64.res" pid=12452 comm="python3" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1400 audit(1667373473.592:400): apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=12452 comm="python3" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 audit[12571]: AVC apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/zoneinfo64.res" pid=12571 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 audit[12572]: AVC apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/zoneinfo64.res" pid=12572 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 audit[12572]: AVC apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=12572 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 audit[12571]: AVC apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=12571 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1400 audit(1667373473.632:401): apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/zoneinfo64.res" pid=12571 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1400 audit(1667373473.632:402): apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/zoneinfo64.res" pid=12572 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1400 audit(1667373473.632:403): apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=12572 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Nov 02 08:17:53 ubuntu-2204 kernel: audit: type=1400 audit(1667373473.632:404): apparmor="DENIED" operation="open" profile="snap.anki-ppd.anki" name="/usr/share/zoneinfo-icu/44/le/timezoneTypes.res" pid=12571 comm="QtWebEngineProc" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0

The issue is also described for QT5 and Flatpak here: ibus/ibus#2220 They mention a workaround (setting environment variables), but it doesn't work for me.

@ppd ,it would be great if you could have a look at this.