I have two servers running 12.04 LTS. #1 has upgraded to kernel 3.2.0-57. #2 is stuck on 3.2.0-34. #2 is getting all other package upgrades. BUT, the kernel is never upgraded. This is what I have researched:

  1. /etc/apt/sources.list are identical on both servers.
  2. The repository caches are identical, verified by: apt-cache search , and: dpkg -L linux-image.

I have done: sudo apt-get update on the faulty server. I have done: sudo apt-get upgrade on the faulty server.

I have verified that the kernel is not "pinned" by the following:

apt-mark unhold linux-image-3.2.0-34-generic

The system replied:

linux-image-3.2.0-generic was already not hold

Why don't this system upgrade the kernel when it gets other packages without a problem? Aptitude is apparently working as other packages seem to update. The cache and source list are the same.


Why don't this system upgrade the kernel when it gets other packages without a problem?

Most likely because you (or somebody) removed the linux-generic metapackage. For the kernel update automatically this package is indispensable:

sudo apt-get install linux-generic

Now you will have automatic Kernel updates.

  • That did it! What could I have studied, or looked at in order to have known this important piece of information? I was basically looking at repository settings and repository cache. Of course, I am immensely gratified for your help. How this got deleted is a mystery. Something happened when /boot partition filled up on a kernel upgrade, and the system failed to boot to the new image. I had to grub back to a download image and clean up some old images. Possibly that is where it got deleted. I was careful to delete these images in groups, like abi, config, initrd, system and vmlinuz. – Raymond Rider Dec 15 '13 at 5:14
  • Check this apt-cache rdepends linux-image-3.2.0-34-generic Then look for a package with the same name but without version. – Braiam Dec 15 '13 at 8:53
  • Trying this same fix today, I needed to install linux-image-generic-lts-trusty instead (for 12.04) - presumably that's a change since 14.04 was released. – Dan Parsonson Aug 25 '15 at 9:27
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    @DanParsonson that's the LTS Enablement Stack, and that doesn't assure you your kernel will be automatically upgraded to the latest kernel for your version of Ubuntu. – Braiam Aug 25 '15 at 11:52
  • @Braiam - indeed, but installing linux-image-generic did not fix the auto-updating problem I had(/have), installing linux-image-generic-lts-trusty also installed the latest kernel, and running apt-cache rdepends on the kernel of another 12.04 box that's auto-updating successfully listed linux-image-generic-lts-trusty but not linux-image-generic. However there hasn't been a new kernel released since my latest attempt at fixing the problem so it may indeed still not be auto-updating - in which case I'm stumped. – Dan Parsonson Aug 26 '15 at 13:23

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