在安装或卸载软件时可能会碰到如题的错误，打开/etc/apt/sources.list
deb http://archive.canonical.com/lucid partner
deb-src http://archive.canoical.com/lucid partner
改为：

deb http://archive.canonical.com/ lucid partner
deb-src http://archive.canoical.com/ lucid partner

即在lucid前加一个空格即可.