Here’s the steps I can currently reproduce this with on my system:

0. Have Gdebi associated with .debs
1. Download http://launchpadlibrarian.net/89242455/linux-generic_3.2.0.8.8_i386.deb in Chromium
2. Click the downloaded file in Chromium’s downloads bar to open it in Gdebi

This results in Gdebi launching and the crash triggering. If I then close Gdebi, it triggers the same crash again (apport points me to this report in both instances).

(I have yet to install the upgrades from this weekend. If any of those change this, I’ll report back.)