package mysql-server-5.7 (not installed) failed to install/upgrade: subprocess new pre-installation script returned error exit status 1

i dont know but

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 (not installed)
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Wed Aug 31 23:16:07 2016
ErrorMessage: subprocess new pre-installation script returned error exit status 1
InstallationDate: Installed on 2016-08-24 (7 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: mysql-5.7
Title: package mysql-server-5.7 (not installed) failed to install/upgrade: subprocess new pre-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.apparmor.d.usr.sbin.mysqld: [modified]
modified.conffile..etc.init.d.mysql: [modified]
modified.conffile..etc.logrotate.d.mysql-server: [modified]
modified.conffile..etc.mysql.debian-start: [deleted]
modified.conffile..etc.mysql.mysql.cnf: [deleted]
modified.conffile..etc.mysql.mysql.conf.d.mysqld.cnf: [deleted]
modified.conffile..etc.mysql.mysql.conf.d.mysqld_safe_syslog.cnf: [deleted]
mtime.conffile..etc.apparmor.d.usr.sbin.mysqld: 2016-06-08T21:31:27
mtime.conffile..etc.init.d.mysql: 2016-02-08T21:06:34
mtime.conffile..etc.logrotate.d.mysql-server: 2016-06-08T19:52:23