** Changed in: lxc (Ubuntu)
       Status: Fix Committed => Fix Released

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  unpriveleged containers no longer could start due to start.c:
  lxc_spawn: 1555 Failed initializing cgroup support

Status in lxc package in Ubuntu:
  Fix Released

Bug description:
  After upgrade from xenial to bionic (beta) I no longer could start
  unpriveleged containers, they failed with following message:

  lxc-start: test: start.c: lxc_spawn: 1555 Failed initializing cgroup support
                         lxc-start: test: start.c: __lxc_start: 1868 Failed to 
spawn container "test"
               The container failed to start.
  Additional information can be obtained by setting the --logfile and 
--logpriority options.

  Moreover, I could see this in auth log:

  Mar 23 18:21:46 host sudo: PAM unable to dlopen(pam_cgfs.so): 
/lib/security/pam_cgfs.so: cannot open shared object file: No such file or 
  Mar 23 18:21:46 host sudo: PAM adding faulty module: pam_cgfs.so

  I have installed libpam-cgfs, but it provides only /lib/x86_64-linux-

  Moreover, if I create a symlink from /lib/security/pam_cgfs.so to
  /lib/x86_64-linux-gnu/security/pam_cgfs.so it fails with follwing

  PAM unable to dlopen(pam_cgfs.so): /lib/security/pam_cgfs.so:
  undefined symbol: file_exists

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: lxc 3.0.0~beta2-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
  Uname: Linux 4.15.0-12-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CurrentDesktop: X-Cinnamon
  Date: Fri Mar 23 18:20:38 2018
   # This is a distribution channel descriptor
   # For more information see 
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-06-22 (274 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 
  PackageArchitecture: all
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)
   lxc.net.0.type = veth
   lxc.net.0.link = lxcbr0
   lxc.net.0.flags = up
   lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx

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