Io in genere non ho problemi con apt, ti posto la mia lista di repository: se vuoi puoi provare ad aggiungere eventuali repository mancanti sul tuo /etc/apt/sources.list

codice:
deb-src http://it.archive.ubuntu.com/ubuntu/ dapper main restricted
deb http://wine.budgetdedicated.com/apt dapper main
deb-src http://wine.budgetdedicated.com/apt dapper main

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

deb http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted
deb http://security.ubuntu.com/ubuntu dapper-security universe
deb-src http://security.ubuntu.com/ubuntu dapper-security universe
##aggiunto per wine
deb http://wine.budgetdedicated.com/apt dapper main
deb http://uk.archive.ubuntu.com/ubuntu dapper universe
deb-src http://uk.archive.ubuntu.com/ubuntu dapper universe
deb-src http://wine.budgetdedicated.com/apt dapper main