I would like to prepare something like recovery partition on the PC hard drive. Such recovery partition should contain only Ubuntu installer, nothing more. It also should be bootable in any way, even without any other bootable operating system - I mean situation when boot loader like GRUB is not available.
It is quite easy to prepare such partition with MS Windows installer: it is just to create NTFS partition, give it a bootable flag, and copy Windows DVD content into it - no voodoo with bootloader required. Is it possible to achieve such setup for Ubuntu as well?
If not, I would also be glad to have such partition bootable from GRUB. I also know that it is easy to boot Ubuntu installer from USB stick, but recovery partition has one big advantage: it cannot be lost.