The exact same thing just happened to me again just now when updating to 2.6.35-24... If it helps, here's the tail of apt's history.log
Start-Date: 2010-12-20 10:01:09 Install: linux-image-2.6.35-24-generic:amd64 (2.6.35-24.42) Upgrade: linux-generic:amd64 (2.6.35.23.25, 2.6.35.24.28), linux-image-generic:amd64 (2.6.35.23.25, 2.6.35.24.28), linux-libc-dev:amd64 (2.6.35-1023.41, 2.6.35-1024.42) End-Date: 2010-12-20 10:01:55 Start-Date: 2010-12-20 14:46:27 Commandline: apt-get install linux-headers-2.6.35-24-generic Install: linux-headers-2.6.35-24:amd64 (2.6.35-24.42, automatic), linux-headers-2.6.35-24-generic:amd64 (2.6.35-24.42) End-Date: 2010-12-20 14:47:39 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/683687 Title: linux-headers not included in 2.6.35-23 upgrade -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs