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I have a server, the current running kernel is 2.6.32-26-server, but I also have the following versions installed (installed through doing aptitude full-upgrade, but not rebooted):

linux-image-2.6.32-25-server
linux-image-2.6.32-26-server
linux-image-2.6.32-27-server
linux-image-2.6.32-30-server

I'd ideally like the server to running on 2.6.32-30-server, but I'm not sure how to get it to boot into that version. The menu.lst file has this entry as the first.

title      Ubuntu 10.04.2 LTS, kernel 2.6.32-30-server
uuid       e1a13f41-eb75-4ebe-aa30-a1699ea7523b
kernel     /vmlinuz-2.6.32-30-server root=UUID=4d012511-0277-4747-8eda-e3734fbb91d4 ro quiet splash 
initrd     /initrd.img-2.6.32-30-server

How can I set the kernel to boot from?

Thanks

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  • try removing the two kernels update 25 and 26. Also try updating the grub as well
    – sagarchalise
    Apr 12, 2011 at 11:17
  • You could also see what grub lists pressing shift during initiation of boot.
    – sagarchalise
    Apr 12, 2011 at 11:23

1 Answer 1

Reset to default
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The variable GRUB_DEFAULT in /etc/default/grub defines the entry to boot by default (counting from 0). The default value is zero, which means that the first entry is going to boot.

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  • just note, that auto configurations have "mind on their own" as result that default can change. As result, when new kernel is installed GRUB_DEFAULT can change to value larger than 0 to boot previous kernel that is known to boot. That happened to me on several Ubuntu server installations, never on desktop.
    – Osis
    Apr 13, 2011 at 7:06

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