Howdy YAMS!
Let me preface by saying I'm a super-noob when it comes to NAS devices. 
I'm attempting to install YAMS on my UGREEN NAS, and I got to the point where I was instructed to enter "sudo chown -R $USER:$USER /srv/media" but it's returning this error: chown: invalid group: ‘KTSAV:KTSAV’
I also noticed when going back through the steps that entering "sudo apt upgrade" I get an error "Please do not perform upgrade, there is an irrecoverable disaster to the system, at your own risk."
Any help is appreciated!
