group.of.nepali.translators team mailing list archive

[Launchpad Bug Tracker <1575200@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.19.0-0ubuntu1

---------------
lightdm (1.19.0-0ubuntu1) yakkety; urgency=medium

  * New upstream release:
    - Use /dev/tty0 instead of /dev/console for VT operations (LP: #1566073)
    - Don't quit on SIGUSR1, SIGUSR2 or SIGHUP (LP: #960157)
    - Improve XDMCP IPv6 address selection (LP: #1575200)
    - Set XDMCP hostname field in to system hostname or configured value
      (LP: #1578442)
    - Allow fcitx and mozc to run in guest session (LP: #1509829)
    - Fix lxsession running in guest session
    - Drop support for legacy XMir
    - Fix g_spawn compiler warning
  * debian/rules:
    - Fix usage of dh_installinit (LP: #1292990)

 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>  Thu, 05 May 2016
12:23:45 +1200

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

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https://bugs.launchpad.net/bugs/1575200

Title:
  Error connecting to X server via IPv6

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Committed
Status in Light Display Manager 1.16 series:
  Fix Committed
Status in Light Display Manager 1.18 series:
  Fix Committed
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Trusty:
  Fix Committed
Status in lightdm source package in Wily:
  Fix Committed
Status in lightdm source package in Xenial:
  Fix Committed

Bug description:
  I've discovered a problem in lightdm XDMCP using link-local IPv6 addresses without interface index to connect to X server.
  It has been originally reported at https://bugzilla.redhat.com/show_bug.cgi?id=1322775.

  The problem can be fixed by having the XDMCP client not transmitting
  link-local addresses in the request, but if it does, lightdm XDMCP
  server can be a lot smarter if the attached patch is applied.

  It changes the X server address selection order to set the lowest
  preference to link-local addresses, even if matching the source
  address or family.

  This is not 100% full-proof: if only link-local addresses have been
  received, one of them is used anyway. In this case, a complete
  solution would be to determine and set the address interface index if
  not ambiguous.

  However, this patch fixes the problem for most of the non-pathological 
  cases.

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