Suggested link showed me that I should run sudo apt-get upgrade -s
command and it stated that I shouldn't see upgradeable packages, but I
did see. Then, I unchecked trusty-proposed packages and updated the
listed packages. It revealed that a window asks for a password for
disable uefi secure boot during the update. I suppose, I missed that
window during the previous update, or it was somehow hidden since I
did't notice it. Leaving secure boot enabled may have prevented the
loading of closed sourced drivers (maybe wireless and touchpad in my
case). I disabled secure boot using this prompt, and now I can see a
temporary screen during ubuntu boot with "booting in insecure mode". New
kernel (3.13.0-92-generic) loads fine, wireless and touchpad works now
as expected. Secure boot in computer's original "BIOS" is seems to be
left enabled, so I can still boot Windows 8 as well without problems.
This issue can be closed.

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https://bugs.launchpad.net/bugs/1604814

Title:
  Newest kernel update disables wireless and touchpad

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