Ubuntu team announced the availability of final version of Ubuntu 15.04 Vivid Vervet and all other flavors, Ubuntu Mate is now officially added to Ubuntu family. Ubuntu 15.04 will be supported for 9 months for Ubuntu Desktop, Ubuntu Server, Ubuntu Core, Kubuntu, Ubuntu Kylin along with all other flavors. The final release of Ubuntu 15.04 Desktop, Server, Cloud, and Core products. This release includes images from not only the Ubuntu Desktop, Server, Cloud, and Core products, but also the Kubuntu, Lubuntu, Ubuntu GNOME, Ubuntu Kylin, Ubuntu Studio, Ubuntu Mate and Xubuntu flavors. Vivid Vervet final version includes most recent versions of core set of packages, notable changes: Linux kernel 3.19.x, Boot service: systemd, Unity 7.3, Compiz 0.9.12, Firefox 36, LibreOffice 4.4, Chromium 41, Mesa 10.5.x, Xorg Server 1.17.x, Pulseaudio is updated to version 6 paving the way for a move to Bluez5 next release, and latest versions for other applications; For Ubuntu Server: OpenStack 2015.1, LXC 1.1, and so on.
Official release announcement: "systemd has replaced Upstart as the standard boot and service manager on all Ubuntu flavors except Touch. At the time of the 15.04 release there are no known major problems which prevent booting. The only service which does not currently start is Juju, which will be fixed in a post-release update soon; all other packaged Ubuntu services are expected to work. Upstart continues to control user sessions... You can boot with Upstart once by selecting `Advanced options for Ubuntu' in the GRUB boot menu and starting the `Ubuntu, with Linux ... (upstart)' entry. To switch back permanently, install the upstart-sysv package (this will remove systemd-sysv and ubuntu-standard)."Checkout release notes of Ubuntu 15.04 Vivid Vervet. If you want to upgrade to Ubuntu 15.04 Vivid then follow this guide.
