Did you also do the following:
touch /install/.plex.lock
If the lock file doesn’t exist, it will not show the menu items.
As per the quota issue, it looks like you opted to install it on the root mount, rather than your /home mount.
Change this:
/ was on /dev/sda2 during installation
UUID=001a1c43-fcc5-4077-a603-acc9575b6ce4 / ext4 usrquota,error$
/boot was on /dev/sda1 during installation
UUID=216ffc85-83eb-457c-86e1-968e4c0972ea /boot ext4 defaults $
/home was on /dev/sda4 during installation
UUID=16d6c99f-996d-4eed-9a7f-bdbaf67ba99d /home ext4 defaults $
swap was on /dev/sda3 during installation
UUID=75daf973-d209-4fd1-b5ab-a789b54402f4 none swap sw $
To this:
/ was on /dev/sda2 during installation
UUID=001a1c43-fcc5-4077-a603-acc9575b6ce4 / ext4 defaults $
/boot was on /dev/sda1 during installation
UUID=216ffc85-83eb-457c-86e1-968e4c0972ea /boot ext4 defaults $
/home was on /dev/sda4 during installation
UUID=16d6c99f-996d-4eed-9a7f-bdbaf67ba99d /home ext4 usrquota,errors=remount-ro $
swap was on /dev/sda3 during installation
UUID=75daf973-d209-4fd1-b5ab-a789b54402f4 none swap sw $