Questo che ti posto è il repository consigliato nel forum internazionale di Ubuntu, gli ultimi specifici per alcuni pacchetti vanno decommentati:
codice:
deb http://archive.ubuntu.com/ubuntu breezy main restricted
deb-src http://archive.ubuntu.com/ubuntu breezy main restricted

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

## Security Updates
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 multiverse
deb-src http://security.ubuntu.com/ubuntu breezy-security universe multiverse

## official backports
deb http://archive.ubuntu.com/ubuntu breezy-backports main restricted universe multiverse

## plf primary repo
## http 100mbit/s mirror provided thanks to OVH http://ovh.com
deb http://packages.freecontrib.org/ubuntu/plf/ breezy free non-free
deb-src http://packages.freecontrib.org/ubuntu/plf/ breezy free non-free

## plf secondary repo. Use if primary repo is offline.
## FTP mirror from http://free.fr (french ISP)
## deb ftp://ftp.free.fr/pub/Distributions_...lf/ubuntu/plf/ breezy free non-free
## deb-src ftp://ftp.free.fr/pub/Distributions_...lf/ubuntu/plf/ breezy free non-free

## plf mirror. Use if primary and secondary are offline
## deb http://public.planetmirror.com/pub/plf/ubuntu/plf/ breezy free non-free

##
## Use the following repos only if you need them.
## To use one remove the "##"  from the line that starts with "## deb".
##

## wine
## deb http://wine.sourceforge.net/apt/ binary/

## opera web browser
## deb http://deb.opera.com/opera/ etch non-free

## Oo2 final - you can optionally use this one until OOo2 final arrives in backports
## deb http://people.ubuntu.com/~doko/OOo2 ./