$ sudo apt-get install mysql-server
Reading package lists... Done
Building dependency tree       
Reading state information... Done
mysql-server is already the newest version.
The following packages were automatically installed and are no longer required:
  libav-tools libavdevice53 libavfilter3 libavresample1 libbs2b0 libctemplate2
  libgtkmm-2.4-1c2a liblua5.1-0 libmpg123-0 libpcrecpp0 libquvi-scripts
  libquvi7 libtinyxml2.6.2 libupstart1 libvdpau1 libzip2
  linux-headers-3.16.0-30 linux-headers-3.16.0-30-generic
  linux-image-3.16.0-30-generic linux-image-extra-3.16.0-30-generic mplayer2
  python-pysqlite2 rtmpdump
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 21 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] yes
Setting up mysql-server-5.5 (5.5.43-0ubuntu0.14.04.1) ...
150508 19:42:55 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
150508 19:42:55 [Note] /usr/sbin/mysqld (mysqld 5.5.43-0ubuntu0.14.04.1) starting as process 2168 ...
start: Job failed to start
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing package mysql-server-5.5 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.5; however:
  Package mysql-server-5.5 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-5.5
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)