Playing around with Ubuntu, help needed

You can't choose to boot the disc from System Prefs, you have to reboot your computer and hold down "C" I believe. Either that or control. I forgot which one. The you can choose to boot from the CD.

 

Indeed..You need to restart your computer and hold down the "C" button whiles the live CD is in the drive....then you can boot up.


Bless

 

Just as a warning, running ubuntu off of a cd is painfully slow unless you have a good amount of ram in your system. You can play around with the programs installed by default and there is a really simple installer which I think is configured to not overwrite your entire hard drive. The only other advice I can give you is to be sure to back everything up before installing, unless you left free space in the partition map, and repartitioning you do will erase everything that you have (OS included)

PS. Boot from the cd by holding down "C", or you could use option to see all available startup disks