Originally Posted by Rylinkus13
I made a Mint uSB drive to liveboot, only to come to the realization I cannot access the files as they're in a folder I don't have permissions to.
Is the old hard drive encrypted? If not, then it doesn't matter. Root (or "sudo" as the case may be) on your live distro will be able to access anything on the old drive with full permissions, as if it was the owner.
To pull data off of an old unencrypted Linux hard drive, you need only boot into a live Linux OS or pull the hard drive and plug it into another machine with a working Linux OS. Then just become root, mount the drive, and copy everything you want off of it.