Oh, I had meant to ask you. Do you find using archive.ubuntu.com, rather than a mirror, to be slow? It's always super-slow for me. (I'm in the US and us.archive.ubuntu.com is way faster for me.)
You laugh, my last mandelbrot set i calculated on this machine took almost 5 days and needed 8 GB Ram and 24 GB swap to get finished and after that it was about 12 GB as data file
Just laughing because I'm impressed you could think of some exotic things to do with 4 CPUs off the top of your head, but I didn't realise they were things you might actually do :)