I am on Ubuntu 22.04.5 LTS. While trying to run RawTherapee 5.11, I get the following warning in the background:
Gtk-Message: 17:13:37.357: Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.
(rawtherapee:8454): GLib-GIO-WARNING **: 17:13:37.796: Error creating IO channel for /proc/self/mountinfo: Permission denied (g-file-error-quark, 2)
Is this anything serious? Within RawTherapee, the only issue that I spotted was that the camera and lens autocorrection profiles do not load.
Might be a missing interface connection, if you check your journal do you see any DENIED messages for rawtherapee ? (also check snap connections ... for the snap)