Just do an sudo apt-get jigdo-file and read the following:

• Debian Jigdo

Where to get downloads

Download the appropriate .jigdo and .template file into a suitable directory on your system.

• Jigdo Releases

Reducing your download

Pretty much the raison-d’etre of Jigdo is the ability to re-use an existing CD to reduce the number of files to be downloaded. But if you’re anything like me it’s much easier to use an ISO:

$ sudo mkdir /mnt/cdrom
$ sudo mount -o loop debian-LennyBeta2-i386-kde-CD-1.iso /mnt/cdrom

Now just enter /mnt/cdrom as the path to the CD to use

References

• Debian Jigdo
• How to use Jigdo Lite