Linux Apt-get Error

[Email protected]:~/ejabberd-15.03$ sudo apt-get install MySQL
Reading Package Lists ... Done
Building Dependency Tree
Reading state information ... Done
E:unable to locate package MySQL
[Email protected]:~/ejabberd-15.03$ sudo apt-get install mysql-client
Reading Package Lists ... Done
Building Dependency Tree
Reading state information ... Done
You might want-to-run ' apt-get-f install ' to correct these:
The following packages has unmet dependencies:
mysql-client:depends:mysql-client-5.5 but it isn't going to being installed
Rabbitmq-server:depends:erlang-nox (>= 1:13.b.3) but it isn't going to be installed or
Esl-erlang but it's not installable
E:unmet dependencies. Try ' apt-get-f install ' with no packages (or specify a solution).

Workaround:
Use the Aptitude command to install mysql-client-5.1

With this tool, when a library relies on a library that is inconsistent with the current version, aptitude attempts to downgrade the current version of the library while addressing the impact of downgrading the library on other software dependencies, and finally successfully installing Apt-get software that cannot be installed.

sudo Install mysql-client-5.1

The following NEW packages'll be installed:
Libdbd-mysql-perl{a} Libdbi-perl{a} Libmysqlclient16{a}
Libnet-daemon-perl{a} Libplrpc-perl{a} mysql-client-5.1
Mysql-client-core-5.1{a} Mysql-common{a}
The following partially installed packages would be configured:
RABBITMQ-SERVER{B}
0 Packages upgraded, 8 newly installed, 0 to remove and no upgraded.
Need to get 11.3MB of archives. After unpacking 27.6MB would be used.

Linux Apt-get Error