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回 2楼dongshan8的帖子 先更新 apt-get update 再执行 apt-get install mysql-server   Reading package lists... Done Building dependency tree       Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: mysql-server : Depends: mysql-server-5.5 but it is not going to be installed E: Unable to correct problems, you have held broken packages. 还是这样 ------------------------- 回 4楼dongshan8的帖子 是的，ubuntu 14.4  我在安装freeradius 时候也出现类似情情况 在/etc/apt/sources.list.d/sources-aliyun-0.list增加两条信息后安装完成 deb XXX mirrors.aliyun.com/ubuntu/ trusty-security main deb-src XXX mirrors.aliyun.com/ubuntu/ trusty-security main //不能发带http://的回复删除 ------------------------- 回 6楼dongshan8的帖子 sources.list 中加入以下内链接，先apt-get update 再apt-get install mysql-server 问题解决 deb XXXX://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb  XXXX://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse deb  XXXX://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb XXXX://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse deb XXXX://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src  XXXX://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb-src  XXXX://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse deb-src  XXXX://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src  XXXX://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse deb-src  XXXX://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse