Comment 8 for bug 1072828

Hi Brian

This was not an upgrade to quantal, but a dist-upgrade of quantal, because of a package had to be removed. Sorry if this was not obvious.
The file you mention was last touched in august:

-rw-r--r-- 1 root root 71017 aug 16 22:01 /var/log/dist-upgrade/main.log

so this won't help us. I have found in /var/log/dist-upgrade/apt.log the following:

Log time: 2012-10-29 15:04:40.963227
Starting
Starting 2
Investigating (0) gir1.2-epiphany-3.4 [ i386 ] < 3.5.4-0ubuntu2 > ( introspection )
Broken gir1.2-epiphany-3.4:i386 Függ ettől on epiphany-browser [ i386 ] < 3.5.4-0ubuntu2 -> 3.6.0-0ubuntu1 > ( universe/gnome ) (= 3.5.4-0ubuntu2)
  Considering epiphany-browser:i386 8 as a solution to gir1.2-epiphany-3.4:i386 -1
  Removing gir1.2-epiphany-3.4:i386 rather than change epiphany-browser:i386

I think this is why update-manager could not run a normal system update and asked me to run a dist-upgrade, which showed me the above screens.
Unfortunately I have no idea how to find a package that would break dependencies in a way that would result in a reproducible dist-upgrade.