Of late on my debian installed nslu2 whenever I tried #apt-get update, I’d get the following public key warnings:
Fetched 2040B in 19s (105B/s)
Reading package lists… Done
W: There are no public key available for the following key IDs:
A70DAF536070D3A1
W: There are no public key available for the following key IDs:
A70DAF536070D3A1
W: You may want to run apt-get update to correct these problems
I found the solution at http://blog.kovyrin.net/2006/11/28/debian-problem-apt-get-update/
The solution is to try
#apt-key update
Apparently this didn’t work. Then I tried
#apt-get install debian-archive-keyring
This worked fine. There is more info at http://www.debian-administration.org/users/dkg/weblog/11