我正在尝试在我的天蓝色云（VM）上安装生产堆栈，但出现以下错误：
TASK: [edxlocal | install mysql 56 and dependencies] **************************
failed: [localhost] => (item=software-properties-common,mysql-server) => {"failed": true, "item": "software-properties-common,mysql-server"}
stderr: E: Unable to correct problems, you have held broken packages.
stdout: Reading package lists...
Building dependency tree...
Reading state information...
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-5.6 but it is not going to be installed
msg: '/usr/bin/apt-get -y -o "Dpkg::Options::=--force-confdef" -o "Dpkg::Options::=--force-confold" --force-yes install 'mysql-server'' failed: E: Unable to correct problems, you have held broken packages.
FATAL: all hosts have already failed -- aborting
PLAY RECAP ********************************************************************
to retry, use: --limit @/root/edx_sandbox.retry
localhost : ok=43 changed=6 unreachable=0 failed=1
任何帮助将不胜感激