16.04 - Impossible to fix broken MySQL5.7 after automated update - Ask Ubuntu

mysql5.7 on ubuntu16.04 has broken after mysql update came through have tried options in 16.04 upgrade broke mysql-server, , went further, purged related version of mysql - , still end following.

reading package lists... done building dependency tree        reading state information... done following additional packages installed:   mysql-client-5.7 mysql-client-core-5.7 mysql-common mysql-server-5.7 mysql-server-core-5.7 suggested packages:   tinyca following new packages installed   mysql-client-5.7 mysql-client-core-5.7 mysql-common mysql-server mysql-server-5.7 mysql-server-core-5.7 0 upgrade, 6 newly install, 0 remove , 0 not upgrade. need 0 b/18.1 mb of archives. after operation, 160 mb of additional disk space used. want continue? [y/n] y preconfiguring packages ... selecting unselected package mysql-common. (reading database ... 275798 files , directories installed.) preparing unpack .../mysql-common_5.7.16-0ubuntu0.16.04.1_all.deb ... unpacking mysql-common (5.7.16-0ubuntu0.16.04.1) ... selecting unselected package mysql-client-core-5.7. preparing unpack .../mysql-client-core-5.7_5.7.16-0ubuntu0.16.04.1_amd64.deb ... unpacking mysql-client-core-5.7 (5.7.16-0ubuntu0.16.04.1) ... selecting unselected package mysql-client-5.7. preparing unpack .../mysql-client-5.7_5.7.16-0ubuntu0.16.04.1_amd64.deb ... unpacking mysql-client-5.7 (5.7.16-0ubuntu0.16.04.1) ... selecting unselected package mysql-server-core-5.7. preparing unpack .../mysql-server-core-5.7_5.7.16-0ubuntu0.16.04.1_amd64.deb ... unpacking mysql-server-core-5.7 (5.7.16-0ubuntu0.16.04.1) ... processing triggers man-db (2.7.5-1) ... setting mysql-common (5.7.16-0ubuntu0.16.04.1) ... update-alternatives: using /etc/mysql/my.cnf.fallback provide /etc/mysql/my.cnf (my.cnf) in auto mode selecting unselected package mysql-server-5.7. (reading database ... 275955 files , directories installed.) preparing unpack .../mysql-server-5.7_5.7.16-0ubuntu0.16.04.1_amd64.deb ... unpacking mysql-server-5.7 (5.7.16-0ubuntu0.16.04.1) ... selecting unselected package mysql-server. preparing unpack .../mysql-server_5.7.16-0ubuntu0.16.04.1_all.deb ... unpacking mysql-server (5.7.16-0ubuntu0.16.04.1) ... processing triggers ureadahead (0.100.0-19) ... processing triggers systemd (229-4ubuntu11) ... processing triggers man-db (2.7.5-1) ... setting mysql-client-core-5.7 (5.7.16-0ubuntu0.16.04.1) ... setting mysql-client-5.7 (5.7.16-0ubuntu0.16.04.1) ... setting mysql-server-core-5.7 (5.7.16-0ubuntu0.16.04.1) ... setting mysql-server-5.7 (5.7.16-0ubuntu0.16.04.1) ... update-alternatives: using /etc/mysql/mysql.cnf provide /etc/mysql/my.cnf (my.cnf) in auto mode renaming removed key_buffer , myisam-recover options (if present) job mysql.service failed because control process exited error code. see "systemctl status mysql.service" , "journalctl -xe" 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 dpkg: dependency problems prevent configuration of mysql-server:  mysql-server depends on mysql-server-5.7; however:   package mysql-server-5.7 not configured yet.  dpkg: error processing package mysql-server (--configure):  dependency problems - leaving unconfigured no apport report written because error message indicates it's follow-up error previous failure.                                                                                                             processing triggers systemd (229-4ubuntu11) ... processing triggers ureadahead (0.100.0-19) ... errors encountered while processing:  mysql-server-5.7  mysql-server e: sub-process /usr/bin/dpkg returned error code (1) 

is there can please recommend - getting fed increasing failures on ubuntu when upgrades made.

this direct result of utomated update happened on 25 october 2016.