Debian 6.0.5 (64 bit)/KDE 4.4.5

I have just migrated to Debian and would like to implement Multiarch.
According to the Debian Wiki it is present in dkpg since 1.16.2.
However, the version in my installation is 1.15.8.3.

When I try to update the Synaptic Package Manager I get some error
messages that don't mean anything to me at this stage in my
understanding (?).

Here are the error messages:

Ignoring file 'opera.list.save' in directory '/etc/apt/sources.list.d/'
as it has an invalid filename extension

Ignoring file 'opera.list.save' in directory '/etc/apt/sources.list.d/'
as it has an invalid filename extension

GPG error: http://cran.case.edu squeeze-cran/ Release: The following
signatures couldn't be verified because the public key is not
available: NO_PUBKEY 06F90DE5381BA480GPG 

error: http://www.deb.us.multimedia.org squeeze Release: The following
signatures were invalid: NODATA 1 NODATA 2

Failed to fetch
http://www.deb.us.multimedia.org/dists/squeeze/main/binary-amd64/Packages.bz2
Sub-process /bin/bzip2 returned an error code (2)

Failed to fetch
http://www.deb.us.multimedia.org/dists/squeeze/non-free/binary-amd64/Packages.bz2
Sub-process /bin/bzip2 returned an error code (2)

Some index files failed to download, they have been ignored, or old
ones used instead.

The /etc/apt/sources.lst is:

# 

# deb cdrom:[Debian GNU/Linux 6.0.5 _Squeeze_ - Official amd64 DVD
Binary-1 20120512-14:34]/ squeeze contrib main

# deb cdrom:[Debian GNU/Linux 6.0.5 _Squeeze_ - Official amd64 DVD
Binary-1 20120512-14:34]/ squeeze contrib main

deb http://security.debian.org/ squeeze/updates main contrib
deb-src http://security.debian.org/ squeeze/updates main contrib
non-free

# squeeze-updates, previously known as 'volatile'
# A network mirror was not selected during install.  The following
entries # are provided as examples, but you should amend them as
appropriate # for your mirror of choice.
#
deb http://ftp.debian.org/debian/ squeeze-updates main contrib
deb http://http.us.debian.org/debian/ squeeze contrib non-free main
deb-src http://http.us.debian.org/debian/ squeeze contrib non-free main
deb-src http://ftp.debian.org/debian/ squeeze-updates main contrib
deb-src http://cran.case.edu/bin/linux/debian squeeze-cran/
deb http://http.us.debian.org/debian squeeze main
deb http://www.deb.us.multimedia.org squeeze main non-free
sources.list (END) 

What I really need is a pointer towards a really basic discussion of
Synaptic an apt.

Thanks in advance.
-- 
Stephen P. Molnar. Ph.D.          Life is a fuzzy set
Foundation for Chemistry          Stochastic and multivariate
www.FoundationForChemistry.com
(614)312-7528 (c)
Skype:  smolnar1


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