Would be interesting to every once in a while test "Using Linux without a network connection" (as in: install everything from usb/media and check all your workflows)
I yard out the drive, attach it to another machine and toss a copy of, e.g., slackware64-current (+ sources) and a bootloader on the drive, put the drive back in its original machine and boot/install without a network.
After that, it may or may not ever see a network depending on what it is slated to do.
I don't know about now, but when Ubuntu came on CD images intended for burning to actual CDs and offline installation, those images included most of the packages you'd ever need. Or at least that was my impression.
I yard out the drive, attach it to another machine and toss a copy of, e.g., slackware64-current (+ sources) and a bootloader on the drive, put the drive back in its original machine and boot/install without a network.
After that, it may or may not ever see a network depending on what it is slated to do.
https://www.slackware.com/