** Tags added: focal

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https://bugs.launchpad.net/bugs/1894356

Title:
  could not acquire name on session bus by simultaneous login by XDMCP
  and keyboard

Status in Light Display Manager:
  New
Status in Ubuntu MATE:
  New
Status in lightdm package in Ubuntu:
  New
Status in lightdm package in Debian:
  Unknown

Bug description:
  This symptom is observed with Ubuntu Mate 20.04.

  1. Create /etc/lightdm/lightdm.conf.d/10-xdmcp.conf as

  [XDMCPServer]
  enabled=true

  and restart lightdm.

  2. Login as a normal user from keyboard.

  3. Login as the same user as 2 from XDMCP gives
  "Could not acquire name on session bus"
  and I cannot login from XDMCP.
  Without Step 2, XDMCP login succeeds.

  The same symptom is reported at
  https://github.com/neutrinolabs/xrdp/issues/1559#issuecomment-623977001
  which recommends removal of "dbus-user-session" Ubuntu package.

  I worked around the above issue by putting
  "unset DBUS_SESSION_BUS_ADDRESS"
  in /etc/X11/Xsession.d/

  The same issue is also reported at
  https://bugs.launchpad.net/ubuntu-mate/+bug/1769353

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