https://wiki.ubuntu.com/WilyWerewolf/ReleaseNotes Before installing/upgrading, there are some important known issues, especially if: * AMD GPU/IGP * Dell XPS 13 * EFI * Virtualbox * Apple Hardware are involved. Other issues are listed too. This Sunday, we'll have the most popular Ubuntu ISOs for 15.04 at the weekly meetup. Bring a flash drive to get a copy.