Comment 4 for bug 1420217

I too verify that 1:0.156.14.18 in precise-proposed fixes the issue.

With update-manager 1:0.156.14.17 the exact output of the "hwe-support-status --show-replacements" is:

administrator@server:~$ hwe-support-status --show-replacements
linux-generic-lts-trusty libgl1-mesa-glx-lts-trusty xserver-xorg-lts-trusty linux-image-generic-lts-trusty

and after upgrading update-manager to 1:0.156.14.18 the output is:

administrator@server:~$ hwe-support-status --show-replacements
linux-generic-lts-trusty libgl1-mesa-glx-lts-trusty linux-image-generic-lts-trusty linux-signed-generic-lts-trusty linux-signed-image-generic-lts-trusty xserver-xorg-lts-trusty

Also, as mentioned by Alkis Georgopoulos at the above comment after removing the update-manager package the exact output of the command "hwe-support-status" 1:0.156.14.17 gives an apt-get line without requiring the "--show-replacements" and without mentioning the signed packages.

administrator@server:~$ hwe-support-status

Your current Hardware Enablement Stack (HWE) is no longer supported
since 2014-08-07. Security updates for critical parts (kernel
and graphics stack) of your system are no longer available.

For more information, please see:
http://wiki.ubuntu.com/1204_HWE_EOL

To upgrade to a supported (or longer supported) configuration:

* Upgrade from Ubuntu 12.04 LTS to Ubuntu 14.04 LTS by running:
sudo do-release-upgrade

OR

* Install a newer HWE version by running:
sudo apt-get install linux-generic-lts-trusty libgl1-mesa-glx-lts-trusty xserver-xorg-lts-trusty linux-image-generic-lts-trusty

and reboot your system.

And with 1:0.156.14.18 the output is:

administrator@server:~$ hwe-support-status

Your current Hardware Enablement Stack (HWE) is no longer supported
since 2014-08-07. Security updates for critical parts (kernel
and graphics stack) of your system are no longer available.

For more information, please see:
http://wiki.ubuntu.com/1204_HWE_EOL

To upgrade to a supported (or longer supported) configuration:

* Upgrade from Ubuntu 12.04 LTS to Ubuntu 14.04 LTS by running:
sudo do-release-upgrade

OR

* Install a newer HWE version by running:
sudo apt-get install linux-generic-lts-trusty libgl1-mesa-glx-lts-trusty linux-image-generic-lts-trusty linux-signed-generic-lts-trusty linux-signed-image-generic-lts-trusty xserver-xorg-lts-trusty

and reboot your system.

Thanks