Having exactly the same issue.
CPU: AMD Ryzen 9 5900X
GPU: Nvidia RTX 3080Ti
OS: Ubuntu 20.04.3 LTS
When i install enpass via snap store, i get the following error message:
Gtk-Message: 18:34:50.871: Failed to load module "canberra-gtk-module"
Again, if changing the nvidia driver from nvidia-driver-470 to the X.Org X server, Enpass is able to start, but the error message still appears.
re-installing the canberra-gtk-module does not solve the issue.
Thank you for looking into it