Last night, we piped 4 Mac into Dual-Boot Mac OSX and Ubuntu.
To follow the steps is now quite a routine which can be combined with cheap beers and pizza.
1 install rEfit;
2 create a new partition using Disk Utility;
3 reboot on a Ubuntu 10.10 dvd.
→ 3 Wins - 1 failure
Myriam, Sebastien and Pierre M. switched their machine to the other side.
notes - to be able to partition is better - to have a working cd driver can help (the USB drive didn't work).
At the end of the night, relieved, freed, flabbergasted and more.