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I'm running ubuntu 12.04 and on a different partition there is a ubuntu 14.04 distribution.

When running dmesg one entry is the following:

[ 3161.519138] WARNING: CPU: 1 PID: 4782 at /build/buildd/linux-lts-trusty-3.13.0/drivers/media/v4l2-core/v4l2-dev.c:779 __video_register_device+0x452/0x540 videodev

How come I have a trusty (ie ubuntu 14.04 codename) in the path of this: linux-lts-trusty-3.13.0?

Does this mean I'm somehow not running 12.04?

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I would say that you are running 12.04.5 and it is the hardware enablement stack that was introduced a few months ago. Some relevant parts from the link:

What is HWE?

Hardware Enablement Stacks (HWE) are incorporated into installers for select Ubuntu LTS (Long Term Support) point releases. It is a special Ubuntu feature that provides an LTS release with hardware support introduced in newer Ubuntu releases. For Ubuntu 12.04 the point releases are .2/.3/.4/.5 and the corresponding Ubuntu releases are 12.10/13.04/13.10/14.04.

The HWE path can be obtained in 2 ways:

  • Installing Ubuntu from the media (ISO) for these point releases (where HWE is used by default)
  • Manually installing some packages

End-of-life (EOL) for 12.04, 12.04.1, and 12.04.5 HWE is April 2017 but for the other HWE stacks it is roughly when 14.04.1 is released: Aug 8, 2014.

And why should I care?*

Starting Aug 8, 2014 systems running 12.04.2 HWE, 12.04.3 HWE, or 12.04.4 HWE will no longer receive software updates for the kernel and, if you're running it, the graphics stack.

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