Hi Richard,
Here's what I would probably do:
- create directories on your USB or partition for each of the DVDs
- extract each ISO, and place the contents in the directories
-
if using a separate partition, mount it in your fstab at a location
such as /mnt/deb, or if using a USB, just make sure to always mount it
at the same location when you want to install something
Then you can add a line such as this to your APT sources:
deb [trusted=yes] file:///mnt/deb/DVD1/ buster main
deb [trusted=yes] file:///mnt/deb/DVD2/ buster main
deb [trusted=yes] file:///mnt/deb/DVD3/ buster main
Now
whenever you want to install something, you shouldn't have to worry
about which DVD it was on, APT should just automatically find it.
Jeremy