I do not understand this:
> %AppData%\Microsoft\Windows\Start Menu\Programs\Startup
I originally installed WSL1 and later upgraded to WSL2 on my laptop
but I do not recall ever seeing anything like that on either occasion.
I installed the Ubuntu Linux distribution from the Microsoft Store.
Did you try that?
Windows Subsystem for Linux (WSL) -Step 4(Unable to save the configuration file ) (all 4)