sorry I was in work and tonight is one of my daughter's TaeKwon Do nights. just got back home. I wish I was here, all you needed to do when trying to install Ubuntu was select a mount point. "/" is the root partition mount point. When you selected the partition to install Ubuntu you chose ext 3 as file system. At the bottom should have been mount point option. If you don't choose a mount point that's why you get that message about no root file system. Like the rest of us you live and learn. You can still get this set up so don't worry about it
Ok you have Ubuntu installed but have written over your XP install by installing Ubuntu to the entire disk correct? If that is correct you need to boot the Live CD and run gparted from the CD. System > Administration > Partition Editor. You want to resize the Ubuntu partition to create a partition for XP. Right click the Ubuntu partition and choose resize. You can use your mouse to grab the end of the partition graphic and slide it across to resize or use the numeric sizer. Once you have the size set click apply. This may take some time depending on how much you want to give XP, so be patient. Again do not have your external drives connected to insure there is no data loss on them. Almost always the partitioner works well, but whenever working with partitions there is the possibility something can happen to make you lose data. Don't chance it. Have everything backed up and your back up drive(s) unplugged. After the resize is complete format the new partition to NTFS for XP. Then install XP to the NTFS partition. Unfortunately this will overwrite GRUB. But it is a simple procedure to restore GRUB from the Ubuntu Live CD after XP is installed. But we'll cross that bridge when we arrive there.
To double check I understand what you did: 1) you installed Ubuntu to the entire disk overwriting your XP install. 2) you now have the whole disk allocated to Ubuntu, but want to install XP. If this is correct follow the directions. Any questions just shoot them over to this thread or PM me.
I know we work different shifts so be patient. There are a lot of people who can help you here if need be.
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