Hello Linux Geeksters. As you may know, the Ubuntu RTM branch, used by default on the BQ E4.5 Aquaris Ubuntu Edition, still uses Ubuntu 14.10 Utopic Unicorn as code-base.
But Ubuntu-devel has just switched to Ubuntu 15.04 Vivid Vervet, a new Ubuntu-devel image being promoted yesterday.
Now, Canonical is working hard at an OTA update for Ubuntu-RTM (which should bring battery improvements), but after the new image gets promoted, the Ubuntu RTM branch will also switch to Ubuntu Vivid.
As a reminder, the first Ubuntu phones are BQ Aquaris E4.5 Ubuntu Edition and Meizu MX4 Ubuntu Edition, while the operating system (Ubuntu Touch) is officially supported on the Nexus 4 device developed by Google and LG. Also, the community has started porting the system to the LG Optimus G and OnePlus One smartphones.