Linux - error apt

ola!!! el caso es que tengo Ubuntu Breezy 5.10 y quiero instalar el skype mediante APT.
yo hago apt-cache search skype y no me encuentra nada.
supongo que sera por culpa de mi sources.list pero no sé que es lo que le falta, me podríais ayudar?
tengo otro problema y no sé si tiene relación. Instalé el "chipmunk-log" y lo instaló bien, pero... no lo encuentro y.... no soy capaz de buscarlo porque con "whereis chipmunk-log" no encuentro nada.

(mi sources.list)

deb cdrom:[Ubuntu 5.10 _Breezy Badger_ - Release i386 (20051012)]/ breezy main restricted

deb http://es.archive.ubuntu.com/ubuntu breezy main restricted
deb-src http://es.archive.ubuntu.com/ubuntu breezy main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://es.archive.ubuntu.com/ubuntu breezy-updates main restricted
deb-src http://es.archive.ubuntu.com/ubuntu breezy-updates main restricted

## Uncomment the following two lines to add software from the 'universe'
## repository.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://es.archive.ubuntu.com/ubuntu breezy universe
deb-src http://es.archive.ubuntu.com/ubuntu breezy universe

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://es.archive.ubuntu.com/ubuntu breezy-backports main restricted universe multiverse
deb-src http://es.archive.ubuntu.com/ubuntu breezy-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu breezy-security main restricted
deb-src http://security.ubuntu.com/ubuntu breezy-security main restricted

deb http://security.ubuntu.com/ubuntu breezy-security universe
deb-src http://security.ubuntu.com/ubuntu breezy-security universe

## Añadidos por mi
deb http://archive.ubuntu.com/ubuntu breezy multiverse
deb-src http://archive.ubuntu.com/ubuntu breezy multiverse

## Extras
deb http://ubuntu-backports.mirrormax.net/ breezy-extras main universe multiverse restricted