I'm on 11.10. I check for updates a few times a day using sudo apt-get update && sudo apt-get upgrade. Today, I noticed this: Code: The following packages have been [b]kept back[/b]: linux-generic-pae linux-headers-generic-pae linux-image-generic-pae The following packages will be upgraded: linux-libc-dev 1 upgraded, 0 newly installed, 0 to remove and 3 not upgraded. Need to get 820 kB of archives. After this operation, 8,192 B of additional disk space will be used. Do you want to continue [Y/n]? y Get:1 http://us.archive.ubuntu.com/ubuntu/ oneiric-updates/main linux-libc-dev i386 3.0.0-14.23 [820 kB] Fetched 820 kB in 17s (48.1 kB/s) (Reading database ... 188037 files and directories currently installed.) Preparing to replace linux-libc-dev 3.0.0-13.22 (using .../linux-libc-dev_3.0.0-14.23_i386.deb) ... Unpacking replacement linux-libc-dev ... Setting up linux-libc-dev (3.0.0-14.23) ... Dell:~$ I logged onto askubuntu.com to see what is to be done when stuff is kept back. Running sudo apt-get dist-upgrade as suggested here worked for the OP. Another suggestion was to wait for a couple of days in case the reason was at Ubuntu's end. I have not used sudo apt-get dist-upgrade ever before and was inclined to wait a few days. I don't know why, but I opened Software Manager, something I don't usually do. And there were the packages (~48 MB) waiting to be installed. I was prompted to restart to complete the process which I did and now all is well.