I'd like to see to what extent my system is LTS-supported by means of what packages are supported for 5 years and which are not. I could disregard some non-5yr-supported packages, as some are rarely used or very unlikely to get into (security) issues.

I think this is useful as one can get a report and draw a conclusion, e.g. "my system is 100% LTS", "due to packages X,Y,Z, my system is just 99% LTS", "due to the use of KDE, my system is now 50% LTS".

As related to my answer in the question Does 12.04 LXDE have LTS?, I posted a way to see which packages of Ubuntu feature five years of support. E.g.:

$ apt-cache show unity | grep ^Supported

Supported: 5y



$ apt-cache show lxde-core | grep ^Supported

<no output>

I could write a script to get all information for all the packages, however, the apt-cache commands are horribly slow:

real    0m1.535s

user    0m1.484s

sys     0m0.036s

With 2700+ packages installed, this would take roughly 70 minutes (!).

How can I speed up things and get a report for all non-5yr-supported packages on my system?

I'd prefer a simple apt-* shell command for the use in a simple shell script. If it would require more advanced scripting like going into Python, this is fine too. Eventually, I would like to release a (small) script to create a report on a system easily and quickly.

^{Note: I'm not interested in the discussion about whether or not a specific flavour of Ubuntu provides LTS or not - this is really just packages. You can just mix LTS and non-LTS packages on a system.}