package:mysql-server-5.7:5.7.12-0ubuntu1
Setting up mysql-server-5.7 (5.7.12-0ubuntu1) ...
Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 7.
update-alternatives: error: alternative path /etc/mysql/mysql.cnf doesn't exist
Use of uninitialized value $val in substitution (s///) at /usr/share/perl5/Debconf/Format/822.pm line 83.
Use of uninitialized value $val in concatenation (.) or string at /usr/share/perl5/Debconf/Format/822.pm line 84.
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 2