It seems that you are using the old launcher. Please edit this issue to reflect this. Also, you should get the deb version from: https://www.minecraft.net/en-us/download
This is the bugtracker for the official minecraft launcher for windows/mac/linux. To get help with the PojavLauncher App for android/ios, submit an issue on their github:
https://github.com/PojavLauncherTeam/PojavLauncher/issues
This seems to happen every time I log in to the launcher on another OS. Very annoying on a dual boot setup...
I just found a workaround. I stumbled across following lines in the launcher log:
[Info: 2021-08-07 15:35:30.208672564: NetQueue.cpp(183)] NetQueue: Initiating shutdown.
[Info: 2021-08-07 15:35:30.208765456: NetQueue.cpp(197)] NetQueue: Waiting for worker thread to finish...
[Info: 2021-08-07 15:35:30.208847875: NetQueue.cpp(689)] NetQueue: Worker thread shutting down.
[Info: 2021-08-07 15:35:30.209992888: NetQueue.cpp(200)] NetQueue: Done.
This indicates to me that the problem has to do with the network, so I tried opening the launcher while disconnected from the network, and it started up normally. It also didn't crash when I re-enabled the connection afterwards.
I'm having this issue as well I think. It just crashes before it can even load the game. although I have been able to play once yesterday after reinstalling the launcher, but today it's broken again...
It seems to be fixed now, although the launcher didn't get updated.