lightdm-gtk-greeter-team team mailing list archive

[T Mee <1422794@xxxxxxxxxxxxxxxxxx>]

For me, this problem occurs in Ubuntu-18.04 and 20.04.  It occurs when
dynamic hostnames are used.  However, different errors seem to cause the
LightDM sessions to fail.  But you can look at the logs to see how many
"new session c" sessions are logged.  After a reboot and one login,
there should only be two (using a single display).  The problem occurs
because lightdm starts before the hostname is changed from localhost to
the one from DNS.  So all we have to do is start lightdm after that by
simply changing /lib/systemd/system/lightdm.service to add "network-
online.target" to the end of this line:

After=systemd-user-sessions.service getty@tty7.service plymouth-
quit.service

It works if the network is not plugged in too--the hostname remains
localhost.

This is my solution.  Maybe an expert can review it to see if it is the
right change and hopefully backport it to Ubuntu-18.04 too.

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https://bugs.launchpad.net/bugs/1422794

Title:
  lightdm-gtk-greeter crashed with SIGSEGV in cairo_surface_get_type()

Status in lightdm-gtk-greeter package in Ubuntu:
  Incomplete

Bug description:
  I'm on Xubuntu 15.04 Daily Build.  I simply changed the desktop
  environment in the Login screen from Xubuntu to Xfce, logged in, and
  was told that a system problem was detected before the panels/icons of
  the desktop environment even loaded.

  ProblemType: Crash
  DistroRelease: Ubuntu 15.04
  Package: lightdm-gtk-greeter 2.0.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5
  Uname: Linux 3.18.0-13-generic x86_64
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: amd64
  Date: Tue Feb 17 11:01:23 2015
  ExecutablePath: /usr/sbin/lightdm-gtk-greeter
  InstallationDate: Installed on 2015-02-10 (7 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150208)
  ProcCmdline: /usr/sbin/lightdm-gtk-greeter
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/false
  SegvAnalysis:
   Segfault happened at: 0x7f010b7f7870 <cairo_surface_get_type>:	mov    0x10(%rdi),%eax
   PC (0x7f010b7f7870) ok
   source "0x10(%rdi)" (0x00000010) not located in a known VMA region (needed readable region)!
   destination "%eax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: lightdm-gtk-greeter
  StacktraceTop:
   cairo_surface_get_type () from /usr/lib/x86_64-linux-gnu/libcairo.so.2
   greeter_background_save_xroot ()
   _start ()
  Title: lightdm-gtk-greeter crashed with SIGSEGV in cairo_surface_get_type()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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