>>>>> On Fri, 11 Nov 2016 19:25:59 +0000, Ronald Steele 
>>>>> <rste...@adaptivemethods.com> said:

    > I’m trying to set up FAI to work in an off-line environment (no internet 
access).  To this end I’ve create a apt mirror.  This works fine for a while 
but eventually the mirror expires and apt refuses to us it.

Are you using fai-mirror and fai-cd for creating an offline environment?

    > The config file /etc/apt/apt.config.d/10fai seems to have the
    > lines in it required to ignore the expired mirror, but that
    > doesn’t seem to work.
No, it only ignores unknow keys so unauthendicated packages can be installed.



I guess this config would help:

Acquire::Check-Valid-Until "0";

See: 
http://unix.stackexchange.com/questions/2544/how-to-work-around-release-file-expired-problem-on-a-local-mirror

-- 
regards Thomas

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