Also note that the snap has had weird sandboxing issues in the past. You might want to try with the AppImage instead (at least to rule out Snap’s sandboxing)
I’m having this same problem. I’m using Ubuntu 20.04, and the AppImage version 0.12.19. Obsidian crashes after a second or two of the files app being open, whether I try to open an existing vault or create a new one. I don’t have apparmor or any other program that I believe would be causing a permission issue.
Please go into About in the settings and take a screenshot of the versions shown up in there
If it’s not this information, then I don’t know what you mean, there isn’t an about section in the settings. If you could clarify what versions I would expect to find, I can go from there.
Obsidian is in /home/applications, while other files are in /home/.config/obsidian
Also, as I was poking around, I decided to try opening a vault once again and… it works! I don’t know how it does, the app is still on the same version as it was when I was having the problem.