Trying to install Unstable onto Netra 240 fails

[Per Larsson <per.larsson@bahnhof.se>]

Hi !
Any hints on how to solve this ?
Using unstable netboot and getting an error during installation:

   "Failed to install the base system"
   "The base system installation into /target/ failed."

It seems related to lack of public key ? Extract from /var/log/syslog/:

Mar  3 19:38:35 main-menu[1891]: INFO: Menu item 'base-installer' selected
Mar  3 19:38:40 debootstrap: gpgv:
Mar  3 19:38:40 debootstrap: Signature made Sat Mar  3 08:19:38 2007 UTC 
using DSA key ID 6070D3A1
Mar  3 19:38:40 debootstrap: gpgv:
Mar  3 19:38:40 debootstrap: Can't check signature: public key not found
Mar  3 19:38:55 base-installer: error: exiting on error 
base-installer/debootstrap-failed
Mar  3 19:41:43 main-menu[1891]: WARNING **: Configuring 
'base-installer' failed with error code 1
Mar  3 19:41:43 main-menu[1891]: WARNING **: Menu item 'base-installer' 
failed.

Regards
///Per