Session creation inhibited when trying to connect to VNC server after Ubuntu 21.04 upgrade

[Hunter Buchanan]

After upgrading to Ubuntu 21.04 from 20.10, connecting to VNC server will not work from some clients. Prompts for password, then the client gives the error message "The connection closed unexpectedly." Gnome-remote-desktop package gives the following error message in syslog:

> gnome-remote-de[111245]: Failed to start remote desktop session: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: Session creation inhibited

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Peter Jose De Sousa (pjds)]

Seeing this bug, checking the logs I see:

Jun 07 17:22:27 pjds-ubuntu gnome-remote-desktop-daemon[30361]: [17:22:27:525] [30361:2971765] [WARN][com.winpr.negotiate] - AcceptSecurityContext status SEC_I_COMPLETE_NEEDED [0x00090313]
Jun 07 17:22:27 pjds-ubuntu gnome-remote-de[30361]: [RDP.RDPGFX] CapsAdvertise: Accepting capability set with version RDPGFX_CAPVERSION_104, Client cap flags: H264 (AVC444): true, H264 (AVC420):>
Jun 07 17:22:28 pjds-ubuntu gnome-remote-de[30361]: Failed to start remote desktop session: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: Session creation inhibited

Just checking google for related issues I came across this upstream bug: https://gitlab.gnome.org/GNOME/gnome-remote-desktop/-/issues/16.

Maybe it's not the same issue though, as I am using RDP.

Cheers,

Peter