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[asgard2 <kamp000x@xxxxxxxx>]

** Description changed:

  Since 15.04 it is not possible to allow access control to a specific
  user.
  
  Tested with the current xubuntu 15.04 live iso file, it is the same problem.
  $ md5sum xubuntu-15.04-desktop-amd64.iso 
  586604cdb814f906f7c18345138f503b  xubuntu-15.04-desktop-amd64.iso
  
  It can easily reproduced by adding another user:
  
  sudo adduser user2
  
  xhost +SI:localuser:user2
  localuser:user2 being added to access control list
  
  su user2
  
  But it is sill not possible to start gui applications.
  
  user2@xubuntu:~$ xclock
  No protocol specified
  Error: Can't open display: :0.0
  
  user2@xubuntu:~$ /usr/bin/firefox
  
  (process:3130): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
  No protocol specified
  No protocol specified
  Error: cannot open display: :0.0
  
+ a workaround would be:
+ xhost +local:
+ non-network local connections being added to access control list
+ 
+ 
  added apport-collect 1448431
  --- 
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CasperVersion: 1.360
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 15.04
  LiveMediaBuild: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  Package: x11-xserver-utils 7.7+2ubuntu2
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Tags:  vivid
  Uname: Linux 3.19.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

-- 
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https://bugs.launchpad.net/bugs/1448431

Title:
  xhost access control fails to add other users

Status in x11-xserver-utils package in Ubuntu:
  New

Bug description:
  Since 15.04 it is not possible to allow access control to a specific
  user.

  Tested with the current xubuntu 15.04 live iso file, it is the same problem.
  $ md5sum xubuntu-15.04-desktop-amd64.iso 
  586604cdb814f906f7c18345138f503b  xubuntu-15.04-desktop-amd64.iso

  It can easily reproduced by adding another user:

  sudo adduser user2

  xhost +SI:localuser:user2
  localuser:user2 being added to access control list

  su user2

  But it is sill not possible to start gui applications.

  user2@xubuntu:~$ xclock
  No protocol specified
  Error: Can't open display: :0.0

  user2@xubuntu:~$ /usr/bin/firefox

  (process:3130): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
  No protocol specified
  No protocol specified
  Error: cannot open display: :0.0

  a workaround would be:
  xhost +local:
  non-network local connections being added to access control list

  
  added apport-collect 1448431
  --- 
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CasperVersion: 1.360
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 15.04
  LiveMediaBuild: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  Package: x11-xserver-utils 7.7+2ubuntu2
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Tags:  vivid
  Uname: Linux 3.19.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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