For those of you who are having troubles with updating the Avant Windows Navigator for Ubuntu 7.10 Gutsy Gibbon - I hope this helps.

After installing AWN you add these repositories to your source.list:

deb http://download.tuxfamily.org/syzygy42 gutsy avant-window-navigator
deb-src http://download.tuxfamily.org/syzygy42 gutsy avant-window-navigator

And when you sudo apt-get update you get this error:

W: GPG error: http://download.tuxfamily.org gutsy Release: The following signatures couldn’t be verified because the public
key is not available: NO_PUBKEY 3E231AC7F4ECF181

To fix this, please run the following commands:

$ wget http://download.tuxfamily.org/syzygy42/reacocard.asc
$ sudo apt-key add reacocard.asc
$ rm reacocard.asc

Now run

$ sudo apt-get update

No more errors!