I am pushing lxc_1.1.0~alpha2-0ubuntu7 which should fix this bug.  I'm
hoping someone will SRU the patch to T and U.

Note that any container which actually specifies the securityfs mount in
its config (as the default unprivileged ubuntu configs do) should not
have this problem.

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https://bugs.launchpad.net/bugs/1386840

Title:
  failure to start a container

Status in “lxc” package in Ubuntu:
  Triaged
Status in “lxc” source package in Trusty:
  Confirmed
Status in “lxc” source package in Utopic:
  Confirmed

Bug description:
  On utopic using lxc version 1.1.0~alpha2-0ubuntu3, I was unable to
  start a container.

  $ sudo lxc-start -F -n lxc-errors
  lxc-start: lsm/apparmor.c: mount_feature_enabled: 61 Permission denied - 
Error mounting securityfs
  lxc-start: lsm/apparmor.c: apparmor_process_label_set: 186 If you really want 
to start this container, set
  lxc-start: lsm/apparmor.c: apparmor_process_label_set: 187 
lxc.aa_allow_incomplete = 1
  lxc-start: lsm/apparmor.c: apparmor_process_label_set: 188 in your container 
configuration file
  lxc-start: sync.c: __sync_wait: 51 invalid sequence number 1. expected 4
  lxc-start: start.c: __lxc_start: 1087 failed to spawn 'lxc-errors'
  lxc-start: cgmanager.c: cgm_remove_cgroup: 503 call to cgmanager_remove_sync 
failed: invalid request
  lxc-start: cgmanager.c: cgm_remove_cgroup: 505 Error removing 
name=systemd:lxc/lxc-errors-2

  Switching to the version of lxc in http://ppa.launchpad.net/ubuntu-
  lxc/daily/ resolved the failure to start for me.

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