You seem to have some packages installed from a PPA and those are preventing the release upgrade from being calculated.
3202 Investigating (2) libgraphicsmagick++3 [ amd64 ] < 1:1.3.18q16-Q16-1dhor~trusty > ( libs ) 3203 Broken libgraphicsmagick++3:amd64 Зависит on libgraphicsmagick3 [ amd64 ] < 1:1.3.18q16-Q16-1dhor~trusty > ( libs ) (>= 1.3.15) 3204 Considering libgraphicsmagick3:amd64 -2 as a solution to libgraphicsmagick++3:amd64 -1 3205 Added libgraphicsmagick3:amd64 to the remove list 3206 Fixing libgraphicsmagick++3:amd64 via keep of libgraphicsmagick3:amd64 3207 MarkKeep libgraphicsmagick3 [ amd64 ] < 1:1.3.18q16-Q16-1dhor~trusty > ( libs ) FU=0 If you remove those (libgraphicsmagick3 and libgraphicsmagick++3) packages the upgrade may be calculated successfully. ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete ** Summary changed: - can not update 14 to 16 lts + can not update 14 to 16 lts due PPA providing graphicsmagick packages ** Summary changed: - can not update 14 to 16 lts due PPA providing graphicsmagick packages + can not update 14 to 16 lts due to PPA providing graphicsmagick packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1574200 Title: can not update 14 to 16 lts due to PPA providing graphicsmagick packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1574200/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs