I'm new to linux and I have overstepped by abilities. I tried dual booting os x 10.5.8 with ubuntu 11.10 with rEFIt, but I been having problems with partitioning. Instead of enduring more headaches, I've made the decision to simply use ubuntu on VirtualBox. I've tried to return my HDD to normal, but I am looking for confirmation that my partitions are ok. Here is the report from partition inspector:

*** Report for internal hard disk ***

Current GPT partition table:
 #      Start LBA      End LBA  Type
 1         409640    233917359  Mac OS X HFS+

Current MBR partition table:
 # A    Start LBA      End LBA  Type
 1              1    234441647  ee  EFI Protective

MBR contents:
 Boot Code: GRUB

Partition at LBA 409640:
 Boot Code: None
 File System: HFS Extended (HFS+)
 Listed in GPT as partition 1, type Mac OS X HFS+

Also, my HDD directory has a bunch of extra folders in them and they appear to be ubuntu related, although it is no longer installed. folders like bin, sbin, cores, var, user, and so on. Those folders aren't supposed to be there, right? Thanks in advance.