Crazy configs! (read bio!)

in this conversation i would like to know what weird configurations of ubuntu MATE or any other flavors of ubuntu you have setup how did it work, what did you do to make it work (if it did not work well in the first place)
what machine did you install it on (single board pc, risc V cpu etc) what happened when you ran ubuntu on the machine and if you would suggest the configuration. (or not)