我正在尝试安装 phpmyadmin 和 LAMP 堆栈，但是当我写入终端时sudo apt-get install phpmyadmin出现以下错误：
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:
phpmyadmin : Depends: php5-mysql but it is not going to be installed or
php5-mysqli but it is not installable or
php5-mysqlnd but it is not going to be installed
Recommends: php5-gd but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
我尝试安装 php5-gd 但出现以下错误：
The following packages have unmet dependencies:
php5-gd : Depends: php5-common (= 5.6.11+dfsg-1ubuntu3) but 5.6.11+dfsg-1ubuntu3.1 is to be installed
E: Unable to correct problems, you have held broken packages.
我php5-common已经安装了，我尝试安装，5.6.11+dfsg-1ubuntu3.1但是却发现没有找到包。