Sometimes, when using Linux, any of them (Mint, Ubuntu, Arch), happens that "journalctl -f" show a lot of messages like:
Apr 25 17:54:50 hp-laptop rtkit-daemon[132845]: Warning: PolicyKit call failed: Failed to open file “/proc/839993/status”: No such file or directory
Apr 25 17:54:56 hp-laptop rtkit-daemon[132845]: Warning: PolicyKit call failed: Process not found
Apr 25 17:54:58 hp-laptop rtkit-daemon[132845]: Warning: PolicyKit call failed: Process not found
Apr 25 17:55:02 hp-laptop rtkit-daemon[132845]: Warning: PolicyKit call failed: Process not found
Apr 25 17:55:03 hp-laptop rtkit-daemon[132845]: Warning: PolicyKit call failed: Process not found