(Firing up a vm to reproduce) The error message has been fixed in 0.39-2ubuntu4 uploaded today to xenial.
Can you show your /proc/self/cgroup output? Mine shows ubuntu@beret:~$ cat /proc/self/cgroup 11:blkio:/user.slice 10:hugetlb:/ 9:memory:/user.slice 8:cpu,cpuacct:/user.slice 7:perf_event:/ 6:freezer:/user/ubuntu/0 5:cpuset:/ 4:net_cls,net_prio:/user.slice 3:pids:/user.slice/user-1000.slice/session-2.scope 2:devices:/user.slice 1:name=systemd:/user.slice/user-1000.slice/session-2.scope which is correct. Systemd gave me a name=systemd cgroup, and libpam-cgm gave me freezer. ** Changed in: cgmanager (Ubuntu) Status: New => Incomplete ** Changed in: cgmanager (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1534487 Title: cgroup change failed (freezer) when using sudo To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cgmanager/+bug/1534487/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs