Comment 9 for bug 1341320

Verifying for precise.
I fully updated all the meta packages. And I also removed all the old meta packages.
I only kept a couple of old kernels around.
Then, the previous update-manager-core version produced an empty apt line,
while the newer one didn't.

Exact output:

# dpkg-query -W update-manager-core
update-manager-core 1:0.156.14.17

# 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
and reboot your system.

# dpkg -l '*linux*'|grep ^ii
ii libselinux1 2.1.0-4.1ubuntu1 SELinux runtime shared libraries
ii linux-firmware 1.79.9 Firmware for Linux kernel drivers
ii linux-generic-lts-trusty 3.13.0.46.40 Generic Linux kernel image and headers
ii linux-headers-3.11.0-15 3.11.0-15.25~precise1 Header files related to Linux kernel version 3.11.0
ii linux-headers-3.11.0-15-generic 3.11.0-15.25~precise1 Linux kernel headers for version 3.11.0 on 64 bit x86 SMP
ii linux-headers-3.13.0-46 3.13.0-46.75~precise1 Header files related to Linux kernel version 3.13.0
ii linux-headers-3.13.0-46-generic 3.13.0-46.75~precise1 Linux kernel headers for version 3.13.0 on 64 bit x86 SMP
ii linux-headers-generic-lts-trusty 3.13.0.46.40 Generic Linux kernel headers
ii linux-image-3.11.0-15-generic 3.11.0-15.25~precise1 Linux kernel image for version 3.11.0 on 64 bit x86 SMP
ii linux-image-3.13.0-46-generic 3.13.0-46.75~precise1 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
ii linux-image-generic-lts-trusty 3.13.0.46.40 Generic Linux kernel image
ii linux-libc-dev 3.2.0-58.88 Linux Kernel Headers for development
ii linux-sound-base 1.0.25+dfsg-0ubuntu1.1 base package for ALSA and OSS sound systems
ii pptp-linux 1.7.2-6 Point-to-Point Tunneling Protocol (PPTP) Client
ii syslinux 2:4.05+dfsg-2 collection of boot loaders
ii syslinux-common 2:4.05+dfsg-2 collection of boot loaders (common files)
ii syslinux-legacy 2:3.63+dfsg-2ubuntu5 Bootloader for Linux/i386 using MS-DOS floppies
ii util-linux 2.20.1-1ubuntu3 Miscellaneous system utilities

After updating to .18:

# 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
The following packages are no longer supported:
 linux-headers-3.11.0-15 linux-headers-3.11.0-15-generic linux-image-3.11.0-15-generic
Please upgrade them to a supported HWE stack or remove them if you
no longer need them.