Preparing to unpack .../mysql-client-5.7_5.7.17-0ubuntu0.16.04.1_armhf.deb ...
Unpacking mysql-client-5.7 (5.7.17-0ubuntu0.16.04.1) ...
Selecting previously unselected package mysql-server-5.7.
Preparing to unpack .../mysql-server-5.7_5.7.17-0ubuntu0.16.04.1_armhf.deb ...
Unpacking mysql-server-5.7 (5.7.17-0ubuntu0.16.04.1) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for systemd (229-4ubuntu13) ...
Setting up mysql-client-5.7 (5.7.17-0ubuntu0.16.04.1) ...
Setting up mysql-server-5.7 (5.7.17-0ubuntu0.16.04.1) ...
update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode
Renaming removed key_buffer and myisam-recover options (if present)
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 1