Public bug reported:

# lsb_release -rd
Description:    Ubuntu 22.04 LTS
Release:        22.04

# apt-cache policy gnome-remote-desktop
gnome-remote-desktop:
  Instalados: 42.0-4ubuntu1
  Candidato:  42.0-4ubuntu1
  Tabla de versión:
 *** 42.0-4ubuntu1 500
        500 http://ports.ubuntu.com/ubuntu-ports jammy/main arm64 Packages
        100 /var/lib/dpkg/status

# uname -a
Linux fpgrpi 5.15.0-1005-raspi #5-Ubuntu SMP PREEMPT Mon Apr 4 12:21:48 UTC 
2022 aarch64 aarch64 aarch64 GNU/Linux


Summary of the bug:
-------------------
When I try to connect to gnome-remote-desktop using VNC to a Raspberry Pi 4 
Model B Rev 1.4 (8Gb) under Ubuntu 22.04 LTS the VNC client can't connect 
(connection is refused). The connection passes the Password check validation 
but don't connect (sometimes shows screen garbage before disconnecting).

I've used several VNC clients (Remmina in Ubuntu and Real VNC in
Android) getting the same problem failing either in X11 or Wayland.

Notes: 
- VNC connection does work in in previous Ubuntu 21.10 version with the same 
architecture (arm64) and same Raspberry Pi.
- VNC connection also does work in amd64 machines with Ubuntu 22.04 LTS and 
gnome-remote-desktop 42.0-4ubuntu1, exactly the same software version that 
doesn't work on arm64 (Raspberry Pi).

There is no apport info at all. Also there is almost no info in the
journal regarding this problem. When I try to connect to VNC server it
show this:

On Wayland:
-----------
abr 25 00:21:42 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 1884160 
bytes), total 32768 (slots), used 3 (slots)
abr 25 00:21:42 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 4169728 
bytes), total 32768 (slots), used 3 (slots)
abr 25 00:21:42 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8130560 
bytes), total 32768 (slots), used 83 (slots)
abr 25 00:21:42 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400 
bytes), total 32768 (slots), used 3 (slots)
abr 25 00:21:42 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400 
bytes), total 32768 (slots), used 3 (slots)
abr 25 00:21:42 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400 
bytes), total 32768 (slots), used 3 (slots)
abr 25 00:21:42 fpgrpi kernel: vc4-drm gpu: swiotlb buffer is full (sz: 8294400 
bytes), total 32768 (slots), used 3 (slots)
abr 25 00:21:43 fpgrpi systemd[1381]: gnome-remote-desktop.service: Main 
process exited, code=killed, status=11/SEGV
abr 25 00:21:43 fpgrpi systemd[1381]: gnome-remote-desktop.service: Failed with 
result 'signal'.
abr 25 00:21:43 fpgrpi gnome-shell[1497]: D-Bus client with active sessions 
vanished
abr 25 00:21:43 fpgrpi systemd[1381]: gnome-remote-desktop.service: Scheduled 
restart job, restart counter is at 1.
abr 25 00:21:43 fpgrpi systemd[1381]: Stopped GNOME Remote Desktop.
abr 25 00:21:43 fpgrpi systemd[1381]: Starting GNOME Remote Desktop...
abr 25 00:21:43 fpgrpi systemd[1381]: Started GNOME Remote Desktop.
abr 25 00:21:43 fpgrpi gnome-remote-desktop-daemon[2125]: Cannot load 
libcuda.so.1
abr 25 00:21:43 fpgrpi gnome-remote-desktop-daemon[2125]: Cannot load 
libnvidia-encode.so.1
abr 25 00:21:43 fpgrpi gnome-remote-de[2125]: RDP server started
abr 25 00:21:43 fpgrpi gnome-remote-de[2125]: VNC server started


On X11:
-------
abr 25 00:12:18 fpgrpi systemd[2859]: gnome-remote-desktop.service: Main 
process exited, code=killed, status=11/SEGV
abr 25 00:12:18 fpgrpi gnome-shell[3044]: D-Bus client with active sessions 
vanished
abr 25 00:12:18 fpgrpi systemd[2859]: gnome-remote-desktop.service: Failed with 
result 'signal'.
abr 25 00:12:18 fpgrpi systemd[2859]: gnome-remote-desktop.service: Scheduled 
restart job, restart counter is at 19.
abr 25 00:12:18 fpgrpi systemd[2859]: Stopped GNOME Remote Desktop.
abr 25 00:12:18 fpgrpi systemd[2859]: Starting GNOME Remote Desktop...
abr 25 00:12:18 fpgrpi systemd[2859]: Started GNOME Remote Desktop.
abr 25 00:12:19 fpgrpi gnome-remote-desktop-daemon[23876]: Cannot load 
libcuda.so.1
abr 25 00:12:19 fpgrpi gnome-remote-desktop-daemon[23876]: Cannot load 
libnvidia-encode.so.1
abr 25 00:12:19 fpgrpi gnome-remote-de[23876]: RDP server started
abr 25 00:12:19 fpgrpi gnome-remote-de[23876]: VNC server started

** Affects: gnome-remote-desktop (Ubuntu)
     Importance: Undecided
         Status: New

-- 
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https://bugs.launchpad.net/bugs/1970139

Title:
  VNC Connection doesn't work on arm64 (Raspberry Pi 4 8Gb) in Ubuntu
  22.04 LTS

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