I create also a “regular user” TorUser2
To see if it generate the same problems
This user have the .Xauthority file.\

# as root user
runuser -u TorUser2 -- /opt/tor-browser/start-tor-browser.desktop

return Launching ‘./Browser/start-tor-browser --detach…’
and ps -u TorUser2 return nothing…

I’ve tried also

runuser -l TorUser2 -c '/opt/tor-browser/start-tor-browser.desktop'

/usr/bin/env: ‘./Browser/execdesktop’: No such file or directory

I’ve try one guidance, but it didn’t worked.

I quit the xfce, login as root, did

echo $XAUTHORITY
#returned nothing

XAUTHORITY=/tmp/.Xauthority.tmp
xauth -f $XAUTHORITY generate :0 . trusted

and after few minute it returned

xauth: (argv):1 unable to open display :0 😢

Thank you @mina86@lemmy.wtf I’ve look where point the $XAUTHORITY but it point to another user /home/<aUser>/.Xauthority and to give access to the file I have to change also the permission on the parent folders… not to hot to do so…

I see also the TorUser do not have a file .Xauthority ! I’ve look how generate one for it, but I found no good documentation ! They show how do it once logged with TorUser ! but mine is not meant to be used to login on the system…

Thanks @mumblerfish@lemmy.world I did

runuser -u TorUser -- echo $DISPLAY and I have the same value as for my other user. :0.0