(Samuel said)
That should be in /boot. Do you have /boot on a separate partition?
How do I determine which partition /boot is in?
The directory mentioned in the error messages is under /boot as you said (thank-you!): --------------- -bash.2[system]: pwd /boot/grub2/themes/system -bash.3[system]: ls -la total 7080 drwxr-xr-x. 2 root root 1024 Oct 11 12:59 . drwxr-xr-x. 4 root root 1024 May 9 2012 .. -rw-r--r--. 1 root root 3621581 May 23 2017 background.png -rw-r--r--. 1 root root 3621581 May 23 2017 fireworks.png -bash.4[system]: ---------------
Are there log files somewhere that have the full error messages showing specifically what 4 things are wanted but missing?