
If while deleting these files you see an error like "The action can't be completed because the folder or a file it is open in another program" that means your AVD is running and you need to close it (or kill its process instance) so you can delete these files. I could see a few of them: & multiinstance.lock.

If the above does not work for you then you can try deleting all the lock files and folders under the location thats prompted in the error,

Android studio yields following error: 18:57:45,396 WARN - # - Failed to start monitoring emulator-5554

Sep 30 18:57:45 jonas-computer kernel: MainLoopThread: segfault at 90 ip 00007f9700a5fc84 sp 00007f9661eec428 error 4 in libOpenglRender.so Specifically when I interact with the side panel of the AVD instance, it crashes. I recently installed android studio, and the emulator seems to be buggy at best.
