Используя Ubuntu 16.04 LTS. и не может установить MySQL Server 5.7

Это - то, что я сделал.

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install mysql-server

Это - ошибка, которую я получаю.

chris@LivingRoomDell:~$ sudo apt 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 resolve the situation:

The following packages have unmet dependencies:
mysql-server : Depends: mysql-server-5.7 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Не уверенный, как продолжить двигаться отсюда. Любая справка ценилась бы.

Chris