sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

tekan enter dan diikuti dengan

sudo gedit /etc/apt/sources.list

Text Editor akan menjelaskan mengenai situs di mana ubuntu disambungkan untuk mendapatkan sumbernya. Anda ganti semuanya dengan berikut

## Add comments (##) in front of any line to remove it from being checked.
## Use the following sources.list at your own risk.
# Ubuntu supported packages (packages, GPG key: 437D05B5)
deb http://my.archive.ubuntu.com/ubuntu dapper main restricted
deb http://my.archive.ubuntu.com/ubuntu dapper-updates main restricted
# Ubuntu supported packages (sources, GPG key: 437D05B5)
deb-src http://my.archive.ubuntu.com/ubuntu dapper main restricted
deb-src http://my.archive.ubuntu.com/ubuntu dapper-updates main restricted
# Ubuntu community supported packages (packages, GPG key: 437D05B5)
deb http://my.archive.ubuntu.com/ubuntu dapper universe multiverse
deb http://my.archive.ubuntu.com/ubuntu dapper-updates universe multiverse
# Ubuntu community supported packages (sources, GPG key: 437D05B5)
deb-src http://my.archive.ubuntu.com/ubuntu dapper universe multiverse
deb-src http://my.archive.ubuntu.com/ubuntu dapper-updates universe multiverse
deb http://archive.ubuntu.com/ubuntu dapper main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper main restricted universe multiverse
## MAJOR BUG FIX UPDATES produced after the final release
deb http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse
## UBUNTU SECURITY UPDATES
deb http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse

Simpan file tersebut dan tutup Text Editor