Yes, I'm running lightdm.

$ cat /etc/pam.d/common-session 
session [default=1]                     pam_permit.so
session requisite                       pam_deny.so
session required                        pam_permit.so
session optional                        pam_umask.so
session required        pam_unix.so 
session optional        pam_systemd.so 
session optional        pam_cgfs.so -c freezer,memory,name=systemd

(comments all stripped for brevity

That file should be unmodified relative to the package defaults, or put
another way, I haven't fiddled with it.

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https://bugs.launchpad.net/bugs/1556447

Title:
  lxc-start fails: lxc_cgfsng - cgfsng.c:all_controllers_found:430 - no
  systemd controller mountpoint found

Status in lxc package in Ubuntu:
  Confirmed

Bug description:
  On Ubuntu Xenial pre-release, I see the following, so can't start a
  container:

  [swarren@sprint ~]$ lxc-create -t download -n t2 -- -d ubuntu -r trusty -a 
amd64
  Using image from local cache
  Unpacking the rootfs

  ---
  You just created an Ubuntu container (release=trusty, arch=amd64, 
variant=default)

  To enable sshd, run: apt-get install openssh-server

  For security reason, container images ship without user accounts
  and without a root password.

  Use lxc-attach or chroot directly into the rootfs to set a root password
  or create user accounts.

  
  swarren@sprint ~]$ lxc-start -n t2 -d
  lxc-start: lxc_start.c: main: 344 The container failed to start.
  lxc-start: lxc_start.c: main: 346 To get more details, run the container in 
foreground mode.
  lxc-start: lxc_start.c: main: 348 Additional information can be obtained by 
setting the --logfile and --logpriority options.

  
  [swarren@sprint ~]$ lxc-start -n t2 -d -o /dev/stdout -l debug -F
        lxc-start 20160312101415.704 INFO     lxc_start_ui - 
lxc_start.c:main:264 - using rcfile /home/swarren/.local/share/lxc/t2/config
        lxc-start 20160312101415.705 WARN     lxc_confile - 
confile.c:config_pivotdir:1859 - lxc.pivotdir is ignored.  It will soon become 
an error.
        lxc-start 20160312101415.705 INFO     lxc_confile - 
confile.c:config_idmap:1495 - read uid map: type u nsid 0 hostid 100000 range 
65536
        lxc-start 20160312101415.705 INFO     lxc_confile - 
confile.c:config_idmap:1495 - read uid map: type g nsid 0 hostid 100000 range 
65536
        lxc-start 20160312101415.707 INFO     lxc_lsm - lsm/lsm.c:lsm_init:48 - 
LSM security driver AppArmor
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:342 - processing: .reject_force_umount  # comment 
this to allow umount -f;  not recommended.
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:446 - Adding native rule for reject_force_umount 
action 0
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:do_resolve_add_rule:216 - Setting seccomp rule to reject force umounts

        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:449 - Adding compat rule for reject_force_umount 
action 0
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:do_resolve_add_rule:216 - Setting seccomp rule to reject force umounts

        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:342 - processing: .[all].
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:342 - processing: .kexec_load errno 1.
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:446 - Adding native rule for kexec_load action 327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:449 - Adding compat rule for kexec_load action 327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:342 - processing: .open_by_handle_at errno 1.
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:446 - Adding native rule for open_by_handle_at action 
327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:449 - Adding compat rule for open_by_handle_at action 
327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:342 - processing: .init_module errno 1.
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:446 - Adding native rule for init_module action 327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:449 - Adding compat rule for init_module action 327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:342 - processing: .finit_module errno 1.
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:446 - Adding native rule for finit_module action 
327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:449 - Adding compat rule for finit_module action 
327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:342 - processing: .delete_module errno 1.
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:446 - Adding native rule for delete_module action 
327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:449 - Adding compat rule for delete_module action 
327681
        lxc-start 20160312101415.708 INFO     lxc_seccomp - 
seccomp.c:parse_config_v2:456 - Merging in the compat seccomp ctx into the main 
one
        lxc-start 20160312101415.708 DEBUG    lxc_start - 
start.c:setup_signal_fd:289 - sigchild handler set
        lxc-start 20160312101415.708 DEBUG    lxc_console - 
console.c:lxc_console_peer_default:437 - opening /dev/tty for console peer
        lxc-start 20160312101415.708 INFO     lxc_caps - caps.c:lxc_caps_up:101 
- Last supported cap was 36
        lxc-start 20160312101415.708 DEBUG    lxc_console - 
console.c:lxc_console_peer_default:443 - using '/dev/tty' as console
        lxc-start 20160312101415.708 DEBUG    lxc_console - 
console.c:lxc_console_sigwinch_init:142 - 3200 got SIGWINCH fd 9
        lxc-start 20160312101415.708 DEBUG    lxc_console - 
console.c:lxc_console_winsz:72 - set winsz dstfd:6 cols:347 rows:93
        lxc-start 20160312101415.770 INFO     lxc_start - start.c:lxc_init:488 
- 't2' is initialized
        lxc-start 20160312101415.771 DEBUG    lxc_start - 
start.c:__lxc_start:1259 - Not dropping cap_sys_boot or watching utmp
        lxc-start 20160312101415.771 INFO     lxc_start - 
start.c:resolve_clone_flags:956 - Cloning a new user namespace
        lxc-start 20160312101415.771 INFO     lxc_cgroup - 
cgroup.c:cgroup_init:68 - cgroup driver cgroupfs-ng initing for t2
        lxc-start 20160312101415.771 ERROR    lxc_cgfsng - 
cgfsng.c:all_controllers_found:430 - no systemd controller mountpoint found
  lxc-start: cgfsng.c: all_controllers_found: 430 no systemd controller 
mountpoint found
        lxc-start 20160312101415.771 ERROR    lxc_start - 
start.c:lxc_spawn:1036 - failed initializing cgroup support
  lxc-start: start.c: lxc_spawn: 1036 failed initializing cgroup support
        lxc-start 20160312101415.771 ERROR    lxc_start - 
start.c:__lxc_start:1286 - failed to spawn 't2'
  lxc-start: start.c: __lxc_start: 1286 failed to spawn 't2'
        lxc-start 20160312101415.771 INFO     lxc_conf - 
conf.c:run_script_argv:367 - Executing script 
'/usr/share/lxcfs/lxc.reboot.hook' for container 't2', config section 'lxc'
        lxc-start 20160312101416.276 ERROR    lxc_start_ui - 
lxc_start.c:main:344 - The container failed to start.
  lxc-start: lxc_start.c: main: 344 The container failed to start.
        lxc-start 20160312101416.276 ERROR    lxc_start_ui - 
lxc_start.c:main:348 - Additional information can be obtained by setting the 
--logfile and --logpriority options.
  lxc-start: lxc_start.c: main: 348 Additional information can be obtained by 
setting the --logfile and --logpriority options.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: lxc 2.0.0~rc10-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-12.28-generic 4.4.4
  Uname: Linux 4.4.0-12-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Mar 12 10:14:22 2016
  InstallationDate: Installed on 2016-03-03 (9 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160122.2)
  PackageArchitecture: all
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)
  defaults.conf:
   lxc.network.type = veth
   lxc.network.link = lxcbr0
   lxc.network.flags = up
   lxc.network.hwaddr = 00:16:3e:xx:xx:xx

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