I like Turnkey Linux, which is a collection of pre-built server appliances based on Ubuntu. When you need a server fifteen minutes from now, it’s about the only way you can make it happen.
But as far as I can tell, it doesn’t mount USB drives automatically. That’s fine; these servers are designed to have the minimum necessary for their stated purpose in life and nothing more. Here’s how I mount a USB drive to use for making backups.

