You should not have debian in your sourcesnew problem : http://volatile.debian.org etch/volatile Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EC61E0B0BBE55AB3
Remove the line with debian etch from your /etc/apt/sources.list
and then that's solved
For the missing final newline
Rename the file
/var/lib/dpkg/info/openoffice.org-style-human-list
You'll get some other error but will be able to clean out apt
I doubt the file is needed in "every day use" but if you have problems reinstall - it's in Synaptic that should work by now
I have to come back to you about the printer, scanner and sound