Verkar vara ett vanligt fel det där.
Gjorde en sökning och fann
http://www.perry-nelson.com/blog/2007/1 ... t-problem/
Bland inläggen finns följande lösning:
Hi Perry, I am happy to say that I have found a sollution to this problem (at leat in my case it worked and I got same busybox error as you). So here it is: at boot where you have to choose to install ubuntu press F6 and you get some option there, after quiet spash (or something like that) just add: all_generic_ide, so that it would look something like this: «... quiet splash all_generic_ide --«. After you install it edit /boot/grub/menu.lst and also add all_generic_ide here to the boot option. Hope this works for you too, i'll be waiting your confirmation.