Different kernels on my servers?

Robert Heller heller at deepsoft.com
Wed Jun 10 15:00:53 UTC 2015

At Wed, 10 Jun 2015 07:43:54 -0700 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> So I was getting another server up and running in case my old one died 
> and found they have different kernels.
> Old: Linux knutejohnson 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 
> 16:52:48 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
> New: Linux knute3 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 
> 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
> Both are 14.04.2LTS.  The new one had a kernel held back when I did my 
> update and upgrade so I did a dist-upgrade but it was still a 3.16 
> kernel before that.  The old computer was upgraded from an earlier 
> version of server but that shouldn't stop kernel upgrades? Do I have 
> something set somewhere to prevent my old server from upgrading the kernel?

Did you reboot after doing the dist-upgrade (I know this is probably a silly 
question, but...).

It is *possible* that grub.cfg just did not get updated properly.

What does 'dpgk-query -l linux-generic\*' display?  If it shows the new kernal 
as installed, but rebooting does not boot to the new kernal, then grub.cfg was 
not updated, or at least the grub is not booting the newest kernel by default.

I've had that sort of problem happen on a machine which I 'upgraded' from an
older Ubuntu to CentOS 5, installing CentOS 5 on a different partition, and
'sharing' /boot (I set things up to dual boot, incase things were not fully
setup right with the newer system -- I could boot back to the 'working' Ubuntu
server to maintain production) -- CentOS kernel updates were not updating
grub's configure file to boot the newest kernel, probably because the grub
config file did not exactly 'match' the update script, becuase of my 'manual'
hacking. You might have a similar weirdness going on, and you may have to 
manually tweak grub's config files.

> Thanks,

Robert Heller             -- 978-544-6933
Deepwoods Software        -- Custom Software Services
http://www.deepsoft.com/  -- Linux Administration Services
heller at deepsoft.com       -- Webhosting Services

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