/etc/apt/sources.list を編集

#

# deb cdrom:[Debian GNU/Linux 6.0.1a _Squeeze_ - Official Multi-architecture amd64/i386 NETINST #1 20110320-15:14]/ squeeze main

#deb cdrom:[Debian GNU/Linux 6.0.1a _Squeeze_ - Official Multi-architecture amd64/i386 NETINST #1 20110320-15:14]/ squeeze main

deb http://ftp.jp.debian.org/debian/ squeeze main contrib non-free
deb-src http://ftp.jp.debian.org/debian/ squeeze main contrib non-free

deb http://security.debian.org/ squeeze/updates main contrib non-free
deb-src http://security.debian.org/ squeeze/updates main contrib non-free

# squeeze-updates, previously known as 'volatile'
deb http://ftp.jp.debian.org/debian/ squeeze-updates main contrib non-free
deb-src http://ftp.jp.debian.org/debian/ squeeze-updates main contrib non-free

で，

#aptitude install ssh

さらに

#wget http://prdownloads.sourceforge.net/webadmin/webmin_1.550_all.deb

でDLして

#dpkg -i webmin_1.550_all.deb

でインストール．

これでモニタが必要な操作は一通り終わったはずなんで外してOK，かな？