Matt Zimmerman wrote: > Once you have experimental in your sources.list, do this: > > apt-get -t experimental install apt > > and let me know how it goes. Signatures are verified only during "apt-get update", right? It rather see a warning during install/upgrade/source, too, if the signature does not match or the key has expired. Otherwise, it's fine, and "apt-get update" does indeed catch modified Release files. 8-)