pbuilder create --distribution sarge fails

["Uwe A. P. Würdinger" <wuerdinger@highspeed-firewall.de>]

I was setting up a new build machine to do some backporting and
pbuilder 0.156~bpo.1 from backports.org fails to create base.tgz

uwe@buildbox:~$ sudo pbuilder create --distribution sarge
...
P: Unpacking package apt
P: Configuring package apt
E: Couldn't install system due to errors!
pbuilder: cdebootstrap failed
 -> Aborting with an error
 -> cleaning the build env
    -> removing directory /var/cache/pbuilder/build//19868 and its 
subdirectories

cdebootstrap is 0.3.10bpo1


greets Uwe
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