I believe the following packages, installed from a PPA, are causing an issue with the upgrade process.
libgl1-mesa-dev 10.3.0~git20140523.172ef0c5-0ubuntu0ricotz~saucy 1 libglapi-mesa:i386 10.3.0~git20140523.172ef0c5-0ubuntu0ricotz~saucy 1 libgles2-mesa 10.3.0~git20140523.172ef0c5-0ubuntu0ricotz~saucy 1 mesa-common-dev 10.3.0~git20140523.172ef0c5-0ubuntu0ricotz~saucy 1 Please install the official Ubuntu archive versions of these packages and try the upgrade again. ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1528421 Title: Erro ao Atualizar do 14.04 para 15.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1528421/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs