Here's a screen shot of Ubuntu 22.04 running on the Optiplex 9020.  I had to muck around in the BIOS settings (or whatever you kids call it these days), turning UEFI ON and SecureBOOT OFF.  If you Duck "dell octiplex uubuntu install uefi boot no device found", you'll find extensive explanations.  I had a USB stick I created on a Mac according to the instructions on the Ubuntu site and ran the default desktop install.  Never saw a Microsoft logo on the screen.My goal is to turn this into a monitor driver for a bunch of displays I can use to control compute horsepower throughout the house (including things like the NAS media server and managed switch in the basement, as well as the odd Mac for proprietary stuff).  Everything has been recognized so far, including a VisionTek Radeon 7750 graphics card, a Philips 346E2CUAE monitor (including stereo sound, which was a nice surprise), and an Apple Adjustable Keyboard with the accompanying mouse (look it up on Wikipedia.  I dare you).  The Mac skin is coming along bit-by-bit.  This was a first shot using the native Gnome window system.If you're buying this box for a wireless connection, get a high-speed wireless dongle for it.  The dongle that comes with it is 10BaseT (didn't even know they made that anymore).  I haven't speed-tested the hardware interface.  I'm waiting on a Bluetooth dongle as well.  I plan to use an Apple Magic Mouse with this keyboard eventually.So far, it's also been effectively noise-free, but I haven't really driven it in anger yet.If you're looking to pick up 4-6 boxes to do some OpenStack or cluster experiments or whatever, this would be a very good choice, especially at the re-furb price.