Comment 26 for bug 522197

It doesn't. But people googling for "ureadahead-other main process terminated with status 4" are sent to https://bugs.launchpad.net/ubuntu/+source/ureadahead/+bug/484677 which sends them here. That's how I got here. Pretty clear it's not your bug, but it's also clear that many people are reporting that error and googling for and landing here. Maybe all this will help get them to the proper place.

More info
http://blog.fpmurphy.com/2009/09/project-plymouth.html