Hi all, running linux mint.  Went to synaptic package manger and a added ppa:bitcoin/bitcoin.

Synaptic--->Settings--->Repositories
Clicked "other software" tab than add button. 
ppa: bitcoin/bitcoin

The new ppa address that was added was:
http://ppa.launchpad.net/bitcoin/bitcoin/ubuntu nadia main

Clicked reload and got message:
Failed to fetch http://ppa.launchpad.net/bitcoin/bitcoin/ubuntu/dists/nadia/main/source/Sources  404  Not Found
Failed to fetch http://ppa.launchpad.net/bitcoin/bitcoin/ubuntu/dists/nadia/main/binary-i386/Packages  404  Not Found
Some index files failed to download. They have been ignored, or old ones used instead.

Whats the reason for the linux fail?  No nadia client?  Is the launchpad link deprecated?  Am I?

Want that neat package manager installation.  Also, does it pull in the pubkey from the link?  and is that a safe way to get updates?  who controls that key?  Gavin?  Satoshi?