After upgrading to 15.04 , one computer is very, very slow to boot -several minutes, instead of ~20sec.

I do not know if this helps:

graphical.target @1min 40.961s

└─multi-user.target @1min 40.961s

 └─kerneloops.service @1min 36.392s +16ms

 └─network-online.target @1min 36.391s

  └─network.target @1min 30.948s

    └─wpa_supplicant.service @1min 31.430s +6ms

      └─basic.target @1min 30.414s

        └─sockets.target @1min 30.414s

          └─acpid.socket @1min 30.414s

            └─sysinit.target @1min 30.412s

              └─networking.service @1.941s +49ms

                └─apparmor.service @1.383s +555ms

                  └─local-fs.target @1.381s

                    └─media-andre-6564x2d3236.mount @2min 17.386s

                      └─local-fs-pre.target @1.375s

                        └─systemd-remount-fs.service @1.328s +41ms

                          └─systemd-fsck-root.service @1.197s +129ms

                            └─system.slice @324ms

                              └─-.slice @323ms



andre@andre-Latitude-E5520:~$ systemd 

Failed to create root cgroup hierarchy: Permission denied

Failed to allocate manager object: Permission denied