Trusty Server Netboot fails

[ubuntu-users at localhorst.es]

Hello everyone,

we are installing new Ubuntu server machines over PXE using Netboot.
For a fast off-line installation we mirrored the necessary repositories for Ubuntu Trusty.

Until
 friday everything worked fine. But today the setup process is missing 
the file 
"pool/main/d/debootstrap/debootstrap-udeb_1.0.59ubuntu0.1_all.udeb", 
which does not exists on our webserver anymore. Instead I can see a 
probably updated version called 
"debootstrap-udeb_1.0.59ubuntu0.2_all.udeb".

This is the mirror command we use to keep our repos up-to-date:
debmirror
 --dist=trusty,trusty-backports,trusty-security,trusty-updates 
--section=main,main/debian-installer,multiverse,multiverse/deb
ian-installer,restricted,restricted/debian-installer,universe,universe/debian-installer --arch=i386,amd64 --cleanup  --host=ftp.halifax.rwth-aachen.de --method=http --rsync-extra=none /path/to/webserver

Can anybody tell me how the setup process determines which packages to use for installation.

Thanks.

Regards,
Patrick
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