1)設定ファイルの編集
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
sudo gedit /etc/apt/sources.list
2)下記をコピペ
deb cdrom:[Ubuntu 5.04 _Hoary Hedgehog_ - Release i386 (20050407)]/ hoary main restricted
## Uncomment the following two lines to fetch updated software from the network
deb http://us.archive.ubuntu.com/ubuntu hoary main restricted
deb-src http://us.archive.ubuntu.com/ubuntu hoary main restricted
## Uncomment the following two lines to fetch major bug fix updates produced
## after the final release of the distribution.
deb http://us.archive.ubuntu.com/ubuntu hoary-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu hoary-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://us.archive.ubuntu.com/ubuntu hoary universe
deb-src http://us.archive.ubuntu.com/ubuntu hoary universe
deb http://security.ubuntu.com/ubuntu hoary-security main restricted
deb-src http://security.ubuntu.com/ubuntu hoary-security main restricted
deb http://security.ubuntu.com/ubuntu hoary-security universe
deb-src http://security.ubuntu.com/ubuntu hoary-security universe
deb http://archive.ubuntu.com/ubuntu hoary multiverse
deb-src http://archive.ubuntu.com/ubuntu hoary multiverse
deb ftp://ftp.nerim.net/debian-marillat stable main
deb ftp://ftp.nerim.net/debian-marillat unstable main
deb ftp://ftp.nerim.net/debian-marillat testing main
3)仕上げ
gpg --keyserver wwwkeys.eu.pgp.net --recv-keys 1F41B907
gpg --armor --export 1F41B907 | sudo apt-key add -
sudo apt-get update