The first Ubuntu 15.04 Vivid Vervet beta is now available for download. with most community flavors taking part.
As has been the case for some years the mainline Ubuntu release, that is the version that uses Unity as the default desktop, does not participate in this development milestone.
Not that you'll miss it. Alongside beta downloads for Kubuntu, Lubuntu, Xubuntu, the China-focused Ubuntu Kylin and Ubuntu GNOME is a new build of Ubuntu MATE — which becomes an official flavor as of this milestone.
It is the first new spin to be added to the Ubuntu family since 2013 with Ubuntu Kylin.
Ubuntu MATE 15.04 Beta 1 itself makes for a somewhat rough debut.
The MATE 1.8 series desktop currently has a number of issues with Ubuntu’s glibc. An additional PPA needs to be added to the system's Software Sources so pending fixes can be delivered.
Elsewhere you'll find improvements to the MATE Tweak utility, which gains a session interface layout switching option, fixes for multi-monitor under GTK2, the addition of 'folder-colors', and plenty more.
Testers hopping aboard can also expect a few extra packages to filter down in the coming month, including Caja (file manager) actions installed by default and a new lock keys applet.
[Source: OMG! Ubuntu!]