apt-get install mysql-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  mysql-server
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0 B/10.1 kB of archives.
After this operation, 184 kB of additional disk space will be used.
Selecting previously unselected package mysql-server.
(Reading database ... 385754 files and directories currently installed.)
Preparing to unpack .../mysql-server_5.7.11-0ubuntu6_all.deb ...
Unpacking mysql-server (5.7.11-0ubuntu6) ...
Setting up mysql-server-5.7 (5.7.11-0ubuntu6) ...
update-alternatives: error: alternative path /etc/mysql/mysql.cnf doesn't exist
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)