Definately the best tutorial on the basic control and use of a dual channel ocilliscope.
debian
Updating Packages Using Apt On Old Debian Installs
When attempting to install a new package or update an existing package if you are presented with the error 1E: Release file expired, ignoring http://archive.debian.org/debian-archive/debian/dists/squeeze-lts/Release (invalid since 189d 0h 42min 32s) You will need to Read more…