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I just updated my Ubuntu 14.04 and got a new kernel. This new kernel is not working properly for me so I booted the previous version. Let's call this good old working version "3.13.0-24.47".

Now, I want to keep this "3.13.0-24.47" version until I decide to delete it manually. I want to be able to upgrade my kernel each time there is a new version in hope of getting the one which works again. Until then, I want to use the "3.13.0-24.47".

I'm afraid that next update will delete my "3.13.0-24.47" version because there are only two kernel versions available at a given time on my system (/boot).

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  • Does this help you?
    – Korkel
    May 28, 2014 at 9:40
  • I saw that post and many others. They all talk about removing old versions, not keeping. The best that I found was /etc/kernel/postinst.d/apt-auto-removal script which generates list of kernels that must be kept. I could change this script, but what if the script gets updated at some time.
    – tvrtko
    May 28, 2014 at 9:53

2 Answers 2

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I think you can be confident that your -24 kernel is not going to be overwritten, since the kernel version has been bumped to -27 now.

To be on the safe side, however, you can use any one of the methods described here to lock package linux-image-3.13.0-24-generic.

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  • Yes, -27 is the new one on my system. What when -29 comes along? Wont I loose -24? Also, won't pinning the package prevent me from upgrading to -29?
    – tvrtko
    May 28, 2014 at 9:55
  • Normally, no. The only reason you could lose your -24.47 is if a newer -24 (say, -24.49) comes along, then it would overwrite your -24.47. Locking it will prevent that.
    – fkraiem
    May 28, 2014 at 10:00
  • According to this, Apt will never automatically remove the currently-running kernel, so as long as your -24 is running, you should be fine.
    – fkraiem
    May 28, 2014 at 10:12
  • It seeems that you are right. apt won't remove currently booted version. See comment for /etc/kernel/postinst.d/apt-auto-removal
    – tvrtko
    May 28, 2014 at 10:45
  • You still need to lock it if you want to keep your -24.47, however. Because if -24.49 comes along, as far as Apt is concerned -24.47 will not be removed, it will be upgraded.
    – fkraiem
    May 28, 2014 at 10:48
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While Booting Press Shiftlong it's shows grub and boot from old kernel.

  1. when loged in type Uname-ri will show to current kernel running in your system.

  2. now type dpkg --list | grep linux-image it shall show all kernels in your system.

  3. sudo apt-get purge linux-image-X.XX.XX.XX-generic replace x.xx.xxx with the kernel which u want to remove.

REMEMBER:- Do not Remove current kernel.

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