Xubuntu sees its Xfce desktop bumped to version 4.12, which offers a variety of bug fixes and interface polish improvements. QT applications will now look better on Xubuntu out of the box; when you run a QT application, that QT application will default to the GTK theme Xubuntu uses. In other words, more applications will just look like they should.
Ubuntu Studio is a Ubuntu flavor aimed people who edit video, audio, and graphics. sees some fairly minimal changes. Ubuntu Studio also uses the Xfce desktop, so it gets XFCE 4.12 upgrade, too.
There's also a new metapackage called "ubuntustudio-audio-core". Install this single package and the system will pull in all the packages the Ubuntu Studio Project recommends for an audio-focused installation.
There's also a new release of Ubuntu Kylin, a Ubuntu flavor customized for China that uses the same Unity desktop the main Ubuntu image uses. It includes a fully localized interface, and many popular applications among Chinese userscome pre-installed by default. There's also a "Youker-Assistant" application that functions as a system configuration interface.
Unity's locally integrated menus make an appearance here and improve Ubuntu Kylin's default desktop. Otherwise, the Ubuntu Kylin project says they've fixed a number of localization and internationalization issues throughout the entire Ubuntu project this time around.
What About Edubuntu and Mythbuntu?
There are two other official Ubuntu flavors, but they didn't see any updates this time around. Edubuntu, an education-focused Ubuntu flavor for kids, and Mythbuntu, a media-center flavor with MythTV pre-installed, are both focused on their Ubuntu 14.04 LTS releases.
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