Issue Cant access Plesk, Error 'Can't open or create shared memory by shm.name, Permission denied'

[julianfuerderer]

i got a problem with Plesk (Ubuntu Webserver),- i cant access plesk. I havent change anything before. The following error messages is shown:

Server Error 500 Plesk\Lock\Exception Lock Manager error: '[LockManagerException] Can't open or create shared memory by shm.name: "/run/lock/lmlib/SharedLockManagerStorage0.2.4"; shm.start_size: "8388608"; error "Permission denied"'.

I cant try: Unable to open Plesk: Lock Manager error: Can't open or create shared memory by shm.name

or

Plesk is unavailable after upgrade: Can't open or create shared memory by shm.name

or

Plesk is not accessible: Can't open or create shared memory by shm.name

because i can currently only connect to Server via SSH when in rescue mode. (Dont know why ... idea how to enable/check SSH, so i can connect in normal mode ??)

How can i fix the problem when the rescue mode is running?

Greetings, Julian