How to install or upgrade UV4L on Raspbian Wheezy & Raspbian Jessie for Raspberry Pi
The following instructions refers to installing UV4L on the official Raspbian Linux distributions for any flavour of Raspberry Pi (1, 2, 3, Compute Module, etc…). As these installation instructions are updated and improved very frequently, it is suggested to read them from scratch in case of problems and especially whenever a new UV4L module is announced.