Can't see my system-drive - where is it?

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http://askubuntu.com – I just installed Ubuntu 11.10 on my iMac. I created a partition with Bootcamp and instead of installing windows i installed ubuntu. When installing Ubuntu i selected to install it additionally to Mac OS, not to overwrite. It seems to have been working, but i can't find my ubuntu drive now? I see Mac OS X - drive with all Mac OS data on it, i see "Bootcamp"-Drive, but its empty? This is what sudo fdisk -l gives out, may be helpful for you. WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 2000.4 GB, 200039893401 (HowTos)