Comment 1 for bug 258145

Confirmed here.

chr1s@chris-ubuntuvm:~$ apt-cache policy gnome-session
gnome-session:
  Installed: 2.23.6-0ubuntu1
  Candidate: 2.23.6-0ubuntu1
  Version table:
 *** 2.23.6-0ubuntu1 0
        500 http://gb.archive.ubuntu.com intrepid/main Packages
        100 /var/lib/dpkg/status

Steps to reproduce:
1. Delete ~/.config/autostart if it exists (or move it if you want to retain its contents)
2. Open gnome-session-properties in terminal
3. Add an entry

What should happen:
1. gnome-session-properties should happily create the folder ~/.config/autostart and add a new .desktop file to it

What actually happens:
1. gnome-session-properties fails to create our new .desktop file and spits out the following error:

** (gnome-session-properties:6053): WARNING **: Could not save /home/chr1s/.config/autostart/firefox.desktop file

If you manually add ~/.config/autostart before you try to add the new session entry, then it works. ~/.config/autostart isn't present on a fresh user profile