Comment 37 for bug 321927

Happened to me from an upgrade as well. I also went from Intrepid to Jaunty. I'm not using any encrypted disks. Back when the problem first popped up for me I kept getting messages about only "partial upgrades" being possible.

As of the alpha builds I've been able to mount /dev/pts in fstab to work around the issue. I'm not sure that I ever had an issue with shm. This happened on my laptop which is kept pretty sparse in terms of applications (basically just a basic install with a lamp-server and virtualbox).