首先先備份下原先的更新原始檔：
在終端輸入命令： sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
然後修改更新原始檔：
在終端輸入命令： sudo gedit /etc/apt/sources.list
把裡面內容刪除新增下面的源，儲存退出。
一.骨頭源
deb karmic main restricted universe multiverse
deb karmic-security main restricted universe multiverse
deb karmic-updates main restricted universe multiverse
deb karmic-proposed main restricted universe multiverse
deb karmic-backports main restricted universe multiverse
deb-src karmic main restricted universe multiverse
deb-src karmic-security main restricted universe multiverse
deb-src karmic-updates main restricted universe multiverse
deb-src karmic-proposed main restricted universe multiverse
deb-src karmic-backports main restricted universe multiverse
deb karmic-security main restricted
deb-src karmic-security main restricted
deb karmic-security universe
deb-src karmic-security universe
deb karmic-security multiverse
deb-src karmic-security multiverse
二.上海交大源
deb karmic main restricted universe multiverse
deb karmic-security main restricted universe multiverse
deb karmic-updates main restricted universe multiverse
deb karmic-backports main restricted universe multiverse
deb karmic-proposed main restricted universe multiverse
deb-src karmic main restricted universe multiverse
deb-src karmic-security main restricted universe multiverse
deb-src karmic-updates main restricted universe multiverse
deb-src karmic-backports main restricted universe multiverse
deb-src karmic-proposed main restricted universe multiverse
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