- There is nothing wrong with the
.desktoplauncher, except perhaps for the “Version=” statement, which should be the version of the desktop entry specification, not that of Obsidian. However, that does not matter and the entry can be removed. - The issue is not due to the Appimage’s temporary mount point changing each time it run: this is normal behavior.
I cannot reproduce the issue on Fedora, but I can reproduce the issue on Ubuntu.
[4611:0715/122653.194143:FATAL:setuid_sandbox_host.cc(158)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /tmp/.mount_ObsidiAX72wc/chrome-sandbox is owned by root and has mode 4755.
So the issue is with some configuration of Ubuntu, either erroneously or deliberately (for safety?).
The issue appears to be related to electron apps on systems with the kernelsetting CLONE_NEWUSER disabled (source). You can workaround by disabling the sandbox with the command line option --no-sandbox (see AskUbuntu)