I thought I would post this for anyone else who had installation issues like I did. I installed the Sophos UTM on an Intel NUC, using an old Sony DVD burner I had laying around. During my initial attempts, it kept failing on me. Eventually I was able to pull this info from various locations online and got the installer to work. If anyone wants to correct the Linux syntax, feel free, as I am admittedly not strong when it comes to Linux command line.
Boot from the external usb CD rom drive and press Alt+F2 at the installation process. Now type in the following command to mount the usb device as source for install files:
mount -t iso9660 /dev/sdb1 /install
or
mount -o -t iso9660 /dev/sdb1 /install
and
mount -o -ro -t iso9660 /dev/sr0 /install - sr0 (space) /install same for sda1(space) /install
press Enter and leave the bash with Alt+F1.
I hope this helps others attempting to do the same install that I did!
This thread was automatically locked due to age.