gnupg, apt-get und die Uhrzeit

Beim Installieren von Debian etch auf einem Linksys NSLU2 ist mir heute folgendes Problem untergekommen:

slug:~# apt-get update
[..]
Fetched 99.3kB in 6s (15.8kB/s)                                                                                         
Reading package lists... Done
W: GPG error: http://ftp.at.debian.org etch Release: Unknown error executing gpgv
W: GPG error: http://security.debian.org etch/updates Release: Unknown error executing gpgv
W: You may want to run apt-get update to correct these problems

Nach einigem Suchen dann in /etc/apt/trusted.gpg der Loesungshinweis:

slug:~# gpg --list-keys --keyring /etc/apt/trusted.gpg
/etc/apt/trusted.gpg
--------------------
gpg: key 1DB114E0 was created 121789778 seconds in the future (time warp or clock problem)
pub   1024R/1DB114E0 2004-01-15
uid                  Debian Archive Automatic Signing Key (2004) 

gpg: key 4F368D5D was created 154745192 seconds in the future (time warp or clock problem)
gpg: key 4F368D5D was created 154745192 seconds in the future (time warp or clock problem)
pub   1024D/4F368D5D 2005-01-31
uid                  Debian Archive Automatic Signing Key (2005) 

gpg: key B5F5BBED was created 161957931 seconds in the future (time warp or clock problem)
gpg: key B5F5BBED was created 161957931 seconds in the future (time warp or clock problem)
pub   1024D/B5F5BBED 2005-04-24
uid                  Debian AMD64 Archive Key 
sub   2048g/34FC6FE5 2005-04-24

gpg: key 2D230C5F was created 183883027 seconds in the future (time warp or clock problem)
gpg: key 2D230C5F was created 183883027 seconds in the future (time warp or clock problem)
pub   1024D/2D230C5F 2006-01-03
uid                  Debian Archive Automatic Signing Key (2006) 

gpg: key 6070D3A1 was created 211625927 seconds in the future (time warp or clock problem)
pub   1024D/6070D3A1 2006-11-20
uid                  Debian Archive Automatic Signing Key (4.0/etch) 

D.h. die GPG-Keys wurden wg. des noch falsch eingestellten Datums nicht akzeptiert. Abhilfe war nun einfach:

slug:~# date --set="2006-12-19 17:08"
Tue Dec 19 17:08:00 CET 2006
slug:~# gpg --list-keys --keyring /etc/apt/trusted.gpg
/etc/apt/trusted.gpg
--------------------
[..]

pub   1024D/2D230C5F 2006-01-03 [expires: 2007-02-07]
uid                  Debian Archive Automatic Signing Key (2006) 

pub   1024D/6070D3A1 2006-11-20 [expires: 2009-07-01]
uid                  Debian Archive Automatic Signing Key (4.0/etch) 

slug:~# apt-get update
[..]
Fetched 567B in 6s (94B/s)                                                                                              
Reading package lists... Done
slug:~#