This is the the Galaxy S2 (i9100) Ubuntu Phablet image

Boot into recovery, transfer the i9100 image with adb (adb push /path/to/image.zip /sdcard).
Transfer the Ubuntu Phablet image to the /sdcard folder on the phone with the same method.
(This guide assumes you already have a working CM 10.1 recovery image installed)

Connect with adb shell and mount /dev/mmcblk0p9 as /system
also mount /dev/mmcblk0p10 as /data (make sure /data is clean).

Select "flash image from sdcard" in the bootloader menu, navigate to the i9100 image and flash it.
Repeat that step for the phablet zip file (extracting takes a while, be patient).

After the unpacking is done, reboot the phone and enjoy the broken UI.

This is the the Galaxy S2 (i9100) Ubuntu Phablet image

WIFI does not work in this image yet !

Most of the UI fonts are garbled !