Snapshot.debian.org

E: Release file for http://snapshot.debian.org/archive/debian/20111207T220456Z/dists/unstable/InRelease is expired (invalid since 624d 17u 27min 15s). Updates for this repository will not be applied.

sigh.

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as documented

http://snapshot.debian.org/ -> Usage:

It may be necessary to ignore the Valid-Until header within Release files, in order to prevent apt from disregarding snapshot entries ("Release file expired"). Use aptitude -o Acquire::Check-Valid-Until=false update or apt-get -o Acquire::Check-Valid-Until=false update for this purpose.

Comment by tar-gor — Friday afternoon, August 30th, 2013

Snapshot.debian.org

use e.g.# aptitude -o 'Acquire::Check-Valid-Until=false' and this will be no problem anymore.

Comment by Frank — Friday afternoon, August 30th, 2013

Acquire::Check-Valid-Until=false?

aptitude -o Acquire::Check-Valid-Until=false update or apt-get -o Acquire::Check-Valid-Until=false update

Comment by Alam Arias — Friday evening, August 30th, 2013

Workaround

-o 'Acquire::Check-Valid-Until=false'

Comment by DktrKranz — Friday night, August 30th, 2013

Known and wontfix by Them™

670141

And no, “Acquire::Check-Valid-Until=false” is not acceptable. It may be for lenny (but even there, we have third-party repos with valid keys, and MITM considerations), but definitely NOT for snapshot.d.o, since that’d be only one line on an otherwise more up-to-date Debian system.