I assume that you are trying to install Ubuntu 11.04. There may be a problem or bug in the installer. So due to this you are not able to install the Ubuntu on the same disk where the installer is resided or try to run from. I cannot tell you the proper reason for that error but it seems to that partition is already in use (the installer partition). The solution is not starting the installer but the Live CD mode. After running these commands start the installer:
Code:
$ sudo cp -r /cdrom /cdrom2
$ sudo umount -lfr /cdrom
$ sudo rmdir /cdrom
$ sudo mv /cdrom2 /cdrom
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