This app only works on selected devices. Check the list at the bottom of this description.
This application requires root and it is designed to be used by experienced "power users".

It is strongly recommended to read XDA thread before installing this app you can find links at the bottom of this description.

MultiROM Manager can install or update MultiROM it's recovery and kernels. It can also install Ubuntu Touch system-image based builds into MultiROM as a secondary ROM.

MultiROM is one-of-a-kind multi-boot mod for Android devices. It can boot any Android ROM as well as other systems like Ubuntu Touch. Besides booting from device's internal memory MultiROM can boot from USB drive connected to the device via OTG cable. The main part of MultiROM is a boot manager which appears every time your device starts and lets you choose ROM to boot. You can see how it looks on the left image below and in gallery. ROMs are installed and managed via modified TWRP recovery. You can use standard ZIP files to install secondary Android ROMs daily prebuilt image files to install Ubuntu Touch and MultiROM even has its own installer system which can be used to ship other Linux-based systems.

See XDA threads for more information:
Nexus 7 (2012): http://forum.xda-developers.com/showthread.php?t=2011403
Nexus 7 (2013): http://forum.xda-developers.com/showthread.php?t=2457063
Nexus 4: http://forum.xda-developers.com/showthread.php?t=2472295
Nexus 5: http://forum.xda-developers.com/showthread.php?t=2571011
Nexus 6: http://forum.xda-developers.com/showthread.php?t=3074529
Nexus 6P (unofficial): http://forum.xda-developers.com/showthread.php?t=3313291
OnePlus One (unofficial): http://forum.xda-developers.com/showthread.php?t=2835738
Motorola Moto G (unofficial): http://forum.xda-developers.com/showthread.php?t=2852897
HTC One M7 (unofficial): http://forum.xda-developers.com/showthread.php?t=2880887
HTC One M8 (unofficial): http://forum.xda-developers.com/showthread.php?t=2884413
HTC One X (unofficial): http://forum.xda-developers.com/showthread.php?t=2761149
Samsung Galaxy S4 i9505 (unofficial): http://forum.xda-developers.com/showthread.php?t=2864469
Samsung Galaxy Tab 4 (unofficial): http://forum.xda-developers.com/showthread.php?t=3109777
Sony Xperia Z (unofficial): http://forum.xda-developers.com/showthread.php?t=2843976
Xperia ZL (unofficial): http://forum.xda-developers.com/showthread.php?t=2865686
Xperia Z1 (unofficial): http://forum.xda-developers.com/showthread.php?t=3006363
Xperia Z1 Compact (unofficial): http://forum.xda-developers.com/showthread.php?t=3005654
Xperia Z Ultra (unofficial): http://forum.xda-developers.com/showthread.php?t=3006417
Xperia Z2 (unofficial): http://forum.xda-developers.com/showthread.php?t=3001883
Xperia Z3 (unofficial): http://forum.xda-developers.com/showthread.php?t=3010852
Xperia Z3C (unofficial): http://forum.xda-developers.com/showthread.php?t=3115554
ZTE V5 RedBull (x9180): No XDA thread exists only this announcement in Russian: http://4pda.ru/forum/index.php?s=&showtopic=594539&view=findpost&p=37501224
Xiaomi Redmi 1S (unofficial): http://forum.xda-developers.com/showthread.php?t=3194412
LG G3 D851 and D855 (unofficial): http://forum.xda-developers.com/showthread.php?t=3147242

Donate version: http://bit.ly/1nSnu2o
Thank you!

Source code: https://github.com/Tasssadar/MultiROMMgr