FYI: although I couldn't load my 2.6 crash report in my GUI, looking at the 
tail of the crash log for 2.6
 (gimp-2.6:7327): Gtk-CRITICAL **: IA__gtk_tree_model_get: assertion 
`GTK_IS_TREE_MODEL (tree_model)' failed
 (script-fu:7334): LibGimpBase-WARNING **: script-fu: gimp_wire_read(): error

2.8:
 (gimp-2.8:1552): Gtk-CRITICAL **: IA__gtk_tree_model_get: assertion 
`GTK_IS_TREE_MODEL (tree_model)' failed
 (script-fu:1560): LibGimpBase-WARNING **: script-fu: gimp_wire_read(): error
 
Grepping for title gives Title: gimp-2.x crashed with SIGSEGV in 
completion_match_func() for both

Again, this was fixed (in my case) by 
sudo apt-get install --reinstall lightdm unity-greeter
rm ~/.Xresources
rm ~/.Xauthority
sudo dpkg-reconfigure lightdm #select lightdm, rather than gdm, etc
echo -e "/usr/sbin/lightdm" | sudo tee /etc/X11/default-display-manager #this 
may have been redundant

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https://bugs.launchpad.net/bugs/1048657

Title:
  Ubuntu 12.04 / Gimp - Consistent crash after saving file

Status in “gimp” package in Ubuntu:
  Confirmed

Bug description:
  I started using gimp on a computer where I hadn't used it before. It's
  a dell notebook with a clean 12.04 installation.

  I can create and modify files in gimp, however, every time I save a
  file, it takes a rather long time doing so and eventually, it crashes.

  In my .xsession-errors I see the following every time (PID numbers
  change, obviously):

  (gimp-2.6:28853): Gtk-CRITICAL **: IA__gtk_tree_model_get: assertion 
`GTK_IS_TREE_MODEL (tree_model)' failed
  (script-fu:28866): LibGimpBase-WARNING **: script-fu: gimp_wire_read(): error

  ProblemType: BugDistroRelease: Ubuntu 12.04
  Package: gimp 2.6.12-1ubuntu1.1
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
  Uname: Linux 3.2.0-29-generic x86_64
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  Date: Mon Sep 10 10:55:08 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)SourcePackage: gimp
  UpgradeStatus: No upgrade log present (probably fresh install)

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