Apparmor issues with snap on Ubuntu Desktop

[vic-t]

Describe the bug

On Ubuntu 24.10, I installed Zulip Desktop 5.11.1 using the Snap store. It is properly installed, I can open it. Without having tried to log in, I can navigate the menu and dialogs. But after having typed a single letter in the field "Organization URL" of the dialog "Add a Zulip organization", the window stops responding and is eventually shut down.

Desktop (please complete the following information):

• Operating System: Ubuntu 24.10
• Zulip Desktop Version: 5.11.1

Additional context
I'm seeing several AppArmor errors in the journal.

Feb 07 22:00:35 myhost systemd[2867]: Started run-rb8337065fd8d48e19975124ff0adf4a8.service - /usr/bin/env BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/zulip_zulip.desktop /snap/bin/zulip.
Feb 07 22:00:35 myhost systemd[2867]: Started snap.zulip.zulip-9c60ccb0-382a-45d5-a84a-33dd2cee8355.scope.
Feb 07 22:00:35 myhost kernel: audit: type=1326 audit(1738962035.700:785): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.zulip.zulip pid=25602 comm="zulip" exe="/snap/zulip/53/zulip" sig=0 arch=c000003e syscall=330 compat=0 ip=0x74d8a992e22b code=0x50000
Feb 07 22:00:35 myhost kernel: audit: type=1326 audit(1738962035.701:786): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.zulip.zulip pid=25603 comm="zulip" exe="/snap/zulip/53/zulip" sig=0 arch=c000003e syscall=330 compat=0 ip=0x74082772e22b code=0x50000
Feb 07 22:00:35 myhost kernel: audit: type=1326 audit(1738962035.703:787): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.zulip.zulip pid=25539 comm="zulip" exe="/snap/zulip/53/zulip" sig=0 arch=c000003e syscall=444 compat=0 ip=0x7e417212695d code=0x50000
Feb 07 22:00:36 myhost zulip[25539]: Theme parsing error: gtk.css:1413:23: 'font-feature-settings' is not a valid property name
Feb 07 22:00:36 myhost zulip[25539]: Theme parsing error: gtk.css:3286:25: 'font-feature-settings' is not a valid property name
Feb 07 22:00:36 myhost zulip[25539]: Theme parsing error: gtk.css:3748:23: 'font-feature-settings' is not a valid property name
Feb 07 22:00:36 myhost kernel: audit: type=1107 audit(1738962036.192:788): pid=1091 uid=101 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/" interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" mask="send" name="org.bluez" pid=25539 label="snap.zulip.zulip" peer_pid=1090 peer_label="unconfined"
                                                    exe="/usr/bin/dbus-daemon" sauid=101 hostname=? addr=? terminal=?'
Feb 07 22:00:36 myhost kernel: audit: type=1400 audit(1738962036.212:789): apparmor="DENIED" operation="open" class="file" profile="snap.zulip.zulip" name="/etc/" pid=25539 comm="zulip" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 07 22:00:36 myhost kernel: audit: type=1400 audit(1738962036.212:790): apparmor="DENIED" operation="open" class="file" profile="snap.zulip.zulip" name="/etc/vulkan/implicit_layer.d/" pid=25637 comm="zulip" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 07 22:00:36 myhost kernel: audit: type=1400 audit(1738962036.212:791): apparmor="DENIED" operation="open" class="file" profile="snap.zulip.zulip" name="/etc/vulkan/implicit_layer.d/" pid=25637 comm="zulip" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 07 22:00:36 myhost kernel: audit: type=1400 audit(1738962036.213:792): apparmor="DENIED" operation="open" class="file" profile="snap.zulip.zulip" name="/etc/vulkan/icd.d/" pid=25637 comm="zulip" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 07 22:00:36 myhost kernel: audit: type=1400 audit(1738962036.213:793): apparmor="DENIED" operation="open" class="file" profile="snap.zulip.zulip" name="/etc/vulkan/icd.d/" pid=25637 comm="zulip" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 07 22:00:36 myhost kernel: audit: type=1400 audit(1738962036.213:794): apparmor="DENIED" operation="open" class="file" profile="snap.zulip.zulip" name="/etc/vulkan/implicit_layer.d/" pid=25637 comm="zulip" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 07 22:00:36 myhost env[25539]: Reverting GDK_BACKEND to work around https://github.com/electron/electron/issues/28436
Feb 07 22:00:36 myhost zulip[25539]: Theme parsing error: gtk-dark.css:1413:23: 'font-feature-settings' is not a valid property name
Feb 07 22:00:36 myhost zulip[25539]: Theme parsing error: gtk-dark.css:3286:25: 'font-feature-settings' is not a valid property name
Feb 07 22:00:36 myhost zulip[25539]: Theme parsing error: gtk-dark.css:3748:23: 'font-feature-settings' is not a valid property name
Feb 07 22:00:36 myhost gnome-shell[3222]: Window manager warning: Ping serial 4316699 was reused for window 0x800004 (Zulip), previous use was for window W14 (App Center).

[andersk]

These AppArmor denials are from before the app opened a window. Since the window did open, these messages are likely unrelated to your crash.

Can you check for messages corresponding to the timestamp of the crash? Other places to look include the terminal you started it from (after starting it from a terminal), crash dumps in coredumpctl, and ~/.config/Zulip/Logs.

[BharathC0]

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