在terminal中键入sudo gedit /etc/apt/sources.list,修改sources.list内容为下面4个源其中之一
保存后sudo apt-get update
deb http://ftp.heanet.ie/mirrors/ubuntu/ karmic main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ karmic-backports main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ karmic-proposed main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ karmic-security main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ karmic-updates main multiverse restricted universe
deb-src http://ftp.heanet.ie/mirrors/ubuntu/ karmic main multiverse restricted universe
deb-src http://ftp.heanet.ie/mirrors/ubuntu/ karmic-backports main multiverse restricted universe
deb-src http://ftp.heanet.ie/mirrors/ubuntu/ karmic-proposed main multiverse restricted universe
deb-src http://ftp.heanet.ie/mirrors/ubuntu/ karmic-security main multiverse restricted universe
deb-src http://ftp.heanet.ie/mirrors/ubuntu/ karmic-updates main multiverse restricted universe
deb ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic main multiverse restricted universe
deb ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-backports main multiverse restricted universe
deb ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-proposed main multiverse restricted universe
deb ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-security main multiverse restricted universe
deb ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-updates main multiverse restricted universe
deb-src ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic main multiverse restricted universe
deb-src ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-backports main multiverse restricted universe
deb-src ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-proposed main multiverse restricted universe
deb-src ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-security main multiverse restricted universe
deb-src ftp://ftp.belnet.be/mirror/ubuntu.com/ubuntu/ karmic-updates main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ karmic main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ karmic-backports main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ karmic-proposed main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ karmic-security main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ karmic-updates main multiverse restricted universe
deb-src http://mirror.switch.ch/ftp/ubuntu/ karmic main multiverse restricted universe
deb-src http://mirror.switch.ch/ftp/ubuntu/ karmic-backports main multiverse restricted universe
deb-src http://mirror.switch.ch/ftp/ubuntu/ karmic-proposed main multiverse restricted universe
deb-src http://mirror.switch.ch/ftp/ubuntu/ karmic-security main multiverse restricted universe
deb-src http://mirror.switch.ch/ftp/ubuntu/ karmic-updates main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-backports main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-proposed main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-security main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-updates main multiverse restricted universe
deb-src http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic main multiverse restricted universe
deb-src http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-backports main multiverse restricted universe
deb-src http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-proposed main multiverse restricted universe
deb-src http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-security main multiverse restricted universe
deb-src http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ karmic-updates main multiverse restricted universe
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