Disclaimer: I don't recommend the technique I describe here, but it works fine if that's what you want to do.
It involves downloading two ISOs, one for Xubuntu and another one supported by Wubi. I'll choose lubuntu since it's the smallest.
- Dowload the smallest supported ISO: lubuntu-12.10-desktop-i386.iso
- Download xubuntu-12.10-desktop-amd64.iso (I want 64-bit, but you can use 32-bit too)
- Check the xubuntu md5sum (Wubi will check lubuntu, but you need to check xubuntu).
- Download wubi.exe for release 12.10
- Make sure wubi.exe and the lubuntu ISO are in the same folder. Run Wubi and select lubuntu.
- When it tells you to reboot, select "Reboot later".
- Replace C:\ubuntu\install\installation.iso with the Xubuntu ISO (renaming to installation.iso)
- Mount the Xubuntu ISO and copy initrd.lz and vmlinuz from the /casper/ directory over the one in C:\ubuntu\install
- Edit the preseed.cfg file in C:\ubuntu\install\custom-installation\ so that it installs xubuntu-desktop instead of lubuntu-desktop
- Reboot the computer
- Select Lubuntu
- Watch Xubuntu install
- Reboot, select Lubuntu and boot into your new Xubuntu install.
I used the C: drive for clarity - if you install to a different drive then modify as required.
If it bugs you, you can rename the Lubuntu menu entry to Xubuntu using bcdedit or easyBCD.
Here are some screenshots for selected steps:
|Step 3: Check Xubuntu MD5 sum|
|Step 5: Run wubi.exe with lubuntu in the same folder|
|Step 6: Select to reboot later|
|Step 7a: Delete the existing installation.iso|
|Step 7b: copy the Xubuntu ISO and rename to installation.iso|
|Step 8: Mount the xubuntu ISO and copy vmlinuz and initrd.lz|
|Step 9: Set it to install xubuntu-desktop|
|Step 11: Select Lubuntu|
|Step 12: Watch it install Xubuntu|
Credit: I got this tip from here ironically to install lubuntu prior to it being supported by Wubi.
The original post had this line: "This technique will also likely work with other unsupported flavours e.g. ubuntu-studio". It does with one caveat. Ubuntu Studio doesn't include the package required by grub to generate the menu entries that can boot a loop mounted install (lupin-support). So it will install, but you have to manually boot it the first time from the grub prompt and then install lupin-support.
Here's how to manually boot any Wubi install:
search -s -f -n /ubuntu/disks/root.disk probe --set=diskuuid -u $root loopback loop0 /ubuntu/disks/root.disk set root=(loop0) linux /vmlinuz root=UUID=$diskuuid loop=/ubuntu/disks/root.disk ro quiet splash initrd /initrd.img boot