Comment 47 for bug 1535058

I'm not sure if that helps, but in my case comment 42 did not make a difference, and I've noticed that at least from the regular Unity 7 session cgmanager hadn't been started automatically:

$ sudo service cgmanager status
[sudo] password for dpm:
● cgmanager.service - Cgroup management daemon
   Loaded: loaded (/lib/systemd/system/cgmanager.service; disabled; vendor prese
   Active: inactive (dead)

dpm@el-far:~$ apt-cache policy cgmanager
cgmanager:
  Instaŀlat: 0.39-2ubuntu5
  Candidat: 0.39-2ubuntu5
  Taula de versió:
 *** 0.39-2ubuntu5 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy libpam-cgfs libpam-cgm
libpam-cgfs:
  Instaŀlat: 2.0.0~rc3-0ubuntu1
  Candidat: 2.0.0~rc3-0ubuntu1
  Taula de versió:
 *** 2.0.0~rc3-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
libpam-cgm:
  Instaŀlat: (cap)
  Candidat: 0.39-2ubuntu5
  Taula de versió:
     0.39-2ubuntu5 500
        500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages