There are ready-made slots for Harmattan, Nitdroid, Nemo, FirefoxOS, Ubuntu and SailfishOS


Well, I dont like video guides, they are too complicated
I cannot follow a procedure if seen from a video...
There is the ubiboot wiki page, and some README documentation but both are not quite up-to date (the wiki is much better though)

However, here's a quick run-through how to do it. For simplicity's stake I'll here only go through Nitdroid install, but same kind of thing goes for all the OS'es, except that you might need to put Nemo/SailfishOS to thir own partition. Nitdroid, FirefoxOS and Ubuntu can live on same partition with other OS'es too.

• Download the ubiboot files: http://www.swagman.org/juice/ubiboot...3.4_031013.tar (or http://juiceme.cloud-7.de/ubiboot/ub...3.4_031013.tar)
• Download the preinit files: http://www.swagman.org/juice/ubiboot/other/preinits.tar (or http://juiceme.cloud-7.de/ubiboot/other/preinits.tar)
• Download the l2-fixed open mode kernel: http://www.swagman.org/juice/ubiboot...openmode_l2fix (or http://juiceme.cloud-7.de/ubiboot/ot...openmode_l2fix)
• Download and install whatever Nitdroid version you want to /home/user/nitdroid
• Download the Nitdroid kernel you want
• Unpack the preinit files from preinits.tar to /sbin
• Put all kernels you like to have to /boot
• Unpack ubiboot-02_0.3.4_031013.tar
• Put the ubiboot.conf and ubiboot-02.menus.cpio from the tar file to /home/user/MyDocs/boot
• Review and check your kernel konfiguration matches what's in ubiboot.conf
• To make sure check it again, because you propably made a typo anyway ;D
• Flash the kernel zImage_2.6.32.54-ubiboot-02_031013 to your device
• Enjoy ;D