NBS kernel removals: round two

[Steve Langasek]

Hi folks,

Well, we found out that removing all NBS kernel packages for stable series
was not altogether without its problems for users.  We have modified the
removal policy going forward in response to feedback.

Meanwhile, in preparation for the move of bionic from standard support to
ESM, the Release Team has noticed that NBS cleanup for ESM releases has so
far been deferred until the releases go fully EOL.

At this point, the *newest* kernel image in trusty-security is missing 3
years of security updates.  I believe it's therefore reasonable to require
that users doing deployments of trusty today should do so using a kernel
that is *no more than* 3 years out of date, before immediately enabling
Ubuntu Pro and upgrading to a recent kernel security release.

Consequently, I will be removing all kernel packages older than linux
3.13.0-170.220 from trusty-{updates,security} next week.

I will leave xenial as-is for the moment, and send further mail before
making any changes to NBS packages there.

Thanks,
-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                   https://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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