每个软件包“都没有安装候选对象”
尝试openssh-server在64位Ubuntu 14.04 上安装时,出现以下错误: Package openssh-server is not available but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'openssh-server' has no installation candidate 尝试安装任何软件包时,我看到相同的错误。 这是sources.list文件: deb http://archive.canonical.com/ubuntu hardy partner deb-src http://archive.canonical.com/ubuntu hardy partner