gnowair said: so, if ubuntu touch is not meant to be "installed" by users,then how can a user switch OS on their android?
any ideas anyone?
The short answer is users can't, at the moment. Who knows what the future might bring? It will always be way more complicated to "install" than in a classic x86/x86_64 desktop or laptop. ARM platforms depend on closed source and patents much more than the classic counterparts, Intel/AMD so, in order to have a functional OS on said platforms you need the manufacturer on board. And you'll need to use a lot of proprietary blobs for drivers alone.
As of today, the only Ubuntu Phone in existence is the Spanish Bq Aquaris 4.5 Ubuntu Edition. And it's an overpriced PoS for developers/enthusiasts only. No regular Android/iOS user will jump into the Ubuntu wagon anytime soon. I tested it for a couple of day and felt like going back a decade or so. It's still that rough on the edges, actually worse than Android 1.x.
All things considered, Ubuntu Phone / Ubuntu for Devices won't be ready for the masses before 2018, at best. Sorry for being so negative but it's my current opinion.