[mythtv-users] MythTV-Setup will not open

[Karl Buckland]

Perhaps a few caveats first, just in case:
I'm running Proxmox on my host, with a container running Ubuntu 20.04.
I've managed to give that container access to my TV Tuner card, which
is working (using 'scan' for DVB channels, etc).
I've installed MythTV 31 from the PPA and migrated my database across
from an old installation.
Mythtv Backend has run and upgraded the database. It appears to be
running OK, but hasn't yet been configured with the new tuners.

So - my actual problem. I simply can't get mythtv-setup to run and
open the GUI. When I run it, it asks me to stop the backend, so I
supply my password and the backend stops. It then pretty much
immediately asks if I want to start the backend again and run
mythfilldatabase. The GUI never appears.

I initially tried this using X-Forwarding over SSH and Xming (I'm on a
Windows desktop, with Myth running on a separate PC).

I then installed vncserver and set up XFCE to run in a vnc session as
my user (who is in the mythtv user group). I can run MythFrontend and
it connects to the backend fine and shows me my old recordings. But I
still get the same problem running mythtv-setup.

I can't find any logs being generated from mythtv-setup. There is no
visual output (except for the above) and no command-line output from
mythtv-setup either. Is there a way to debug it, or perhaps something
really obvious that I'm doing wrong?

Any suggestions welcome. Thanks!