For one GParted or the Gnome Partition Editor doesn't get installed since that is strictly a drive tool. When going to install ubuntu where you did list the boot loader for that on the XP or other drive? If you selected the drive where XP is installed it installed the mbr and boot loader there not on the Linux drive causing the search for a chainloader for a dual boot or boot disk.
For seeing the XP boot restored all you would need to do is boot up to the recovery console with the XP installation disk and enter "Fixboot" and "Fixmbr" at the command prompt once logged onto the installation of Windows seen there. Grub4Dos would be one tool for configuring a dual boot once the ubuntu boot information and menu.lst file were installed to the root partition. That would point to that as well as the boot.ini file for XP.
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