md5sum ubuntu-16.04.7-desktop-amd64.iso Compare the output to the list on the server. If it doesn’t match, delete the ISO—it is corrupted or tampered with. Downloading older versions of Ubuntu is like digging through a library's basement stacks. The dust is there, but so are the classics.
LTS releases (04.04, 08.04, 10.04, 12.04, 14.04, 16.04, 18.04, 20.04, 22.04, 24.04) were the "stable ground" of their eras. They received five years of support, meaning their archives are more complete, and their bugs were fixed with surgical precision. ubuntu older versions download
But sometimes, you don’t need the cutting edge. Sometimes, you need the bedrock. md5sum ubuntu-16