Will Haggerty

It would appear that the issue has been resolved.

No, I do not have antivirus on this particular device.

Found a work around, toggling "Keep launcher open" on, will kill the process after closing the game and it.

I can confirm on a fresh install of Ubuntu 18.10, downloading the Minecraft.deb and after playing and then closing the game, the process persists. This prevents opening the launcher again.

[0101/141817:INFO:GameCallbacks.cpp(199)] game/bib (Client thread) info Stopping!

[0101/141817:INFO:GameCallbacks.cpp(199)] game/chm (Client thread) info SoundSystem shutting down...

[0101/141818:INFO:GameCallbacks.cpp(199)] game/chm (Client thread) warn Author: Paul Lamb, www.paulscode.com

[0101/141818:INFO:GameCallbacks.cpp(199)] launcher/launcher (main) info

[0101/141818:INFO:GameCallbacks.cpp(199)] launcher/monitor (Process Monitor) info Process ended with exit code 0

[0101/141818:INFO:GameCallbacks.cpp(31)] Destroying GameCallbacks!

[0101/141827:INFO:mainLinux.cpp(46)] Reopen event triggered!

[0101/141827:INFO:mainLinux.cpp(50)] Asking to focus browser window.

[0101/141827:INFO:ClientHandler.cpp(176)] Launcher is already open!

[0101/141827:WARNING:mainLinux.cpp(25)] X error received: type 0, serial 1217, error_code 3, request_code 3, minor_code 0

[0101/141830:INFO:mainLinux.cpp(46)] Reopen event triggered!

[0101/141830:INFO:mainLinux.cpp(50)] Asking to focus browser window.

[0101/141830:INFO:ClientHandler.cpp(176)] Launcher is already open!

[0101/141830:WARNING:mainLinux.cpp(25)] X error received: type 0, serial 1219, error_code 3, request_code 25, minor_code 0

[0101/141830:WARNING:mainLinux.cpp(25)] X error received: type 0, serial 1220, error_code 3, request_code 42, minor_code 0

[0101/141830:WARNING:mainLinux.cpp(25)] X error received: type 0, serial 1221, error_code 3, request_code 3, minor_code 0