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I have multiple servers running Ubuntu-14.04.2_LTS, just occurred to me that some are running the 3.13 kernel while others runs 3.16; all are maintained identically, so what would explain this?

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    Check wiki.ubuntu.com/Kernel/LTSEnablementStack , also did you recently fresh install 14.04.2 in any of your servers?
    – xangua
    May 4, 2015 at 20:48
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    run the command dpkg -l | grep linux-image on each machine and see if there are any difference there. It looks like you may have the "utopic" lts kernel (3.16) installed on some machines and not on others.
    – mchid
    May 4, 2015 at 20:48
  • Also, are you absolutely sure the servers using the 3.16 kernel are 14.04LTS and not 14.10? I believe running the following command on each server will verify this: uname -a
    – mchid
    May 4, 2015 at 20:54
  • or dpkg -l | grep linux-generic
    – mchid
    May 4, 2015 at 20:56
  • @mchid all servers run LTS to minimize impact/uptime on production environment; I've figured it out, see the answer...
    – ionreflex
    May 5, 2015 at 15:34

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Thanks to the link provided by @xangua, stumble upon this :

Trusty

The 14.04.2 and newer point release will ship with an updated kernel and X stack by default. If you have installed with older media you can use > the following to install the newer kernel from 14.10 (Utopic):

DESKTOP...

SERVER

sudo apt-get install --install-recommends linux-generic-lts-utopic

Also, as @mchid pointed out, servers running 3.16 had the package installed :

nul@nebula:~$ dpkg -l |grep linux-image
ii  linux-image-3.16.0-30-generic       3.16.0-30.40~14.04.1             amd64        Linux kernel image for version 3.16.0 on 64 bit x86 SMP
ii  linux-image-3.16.0-36-generic       3.16.0-36.48~14.04.1             amd64        Linux kernel image for version 3.16.0 on 64 bit x86 SMP
ii  linux-image-extra-3.16.0-30-generic 3.16.0-30.40~14.04.1             amd64        Linux kernel extra modules for version 3.16.0 on 64 bit x86 SMP
ii  linux-image-extra-3.16.0-36-generic 3.16.0-36.48~14.04.1             amd64        Linux kernel extra modules for version 3.16.0 on 64 bit x86 SMP
ii  linux-image-generic-lts-utopic      3.16.0.36.28                     amd64        Generic Linux kernel image

Tried it on a BETA server (14.04.2_LTS running 3.13) and it worked like a charm; as stated, some servers must have been installed with a recent ISO, others must have been dist-upgraded from earlier versions.

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