richard@richard-iMac:~$ sudo apt-get update
[sudo] password for richard:
Hit:1 http://repo.steampowered.com/steam precise InRelease
Ign:2 http://www.6809.org.uk/debian testing InRelease
Hit:3 http://ppa.launchpad.net/c.falco/mame/ubuntu xenial InRelease
Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:5 http://linux.dropbox.com/ubuntu wily InRelease
Hit:6 http://gb.archive.ubuntu.com/ubuntu xenial InRelease
Hit:8 http://linux.dropbox.com/ubuntu wily Release
Hit:9 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease
Get:7 http://www.6809.org.uk/debian testing Release [2,638 B]
Hit:10 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease
Get:11 http://www.6809.org.uk/debian testing Release.gpg [488 B]
Ign:12 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:13 https://repo.skype.com/deb stable InRelease
Hit:14 http://dl.google.com/linux/chrome/deb stable Release
Ign:11 http://www.6809.org.uk/debian testing Release.gpg
Fetched 3,126 B in 1s (2,556 B/s)
Reading package lists... Done
W: GPG error: http://www.6809.org.uk/debian testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 26318813399A679F
W: The repository 'http://www.6809.org.uk/debian testing Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://www.6809.org.uk/debian/dists/testing/Release  Unable to find expected entry 'main/binary-amd64/Packages' in Release file (Wrong sources.list entry or malformed file)
E: Some index files failed to download. They have been ignored, or old ones used instead.
richard@richard-iMac:~$