@Kulfy
OT Kali According to the 4th comment OP is using Kali Linux:
root@kali:~# sudo dpkg -i mysql-5.6.15-debian6.0-x86_64.deb dpkg: regarding mysql-5.6.15-debian6.0-x86_64.deb containing mysql: mysql-community-server conflicts with mysql mysql (version 5.6.15) is to be installed. dpkg: error processing archive mysql-5.6.15-debian6.0-x86_64.deb (--install): conflicting packages - not installing mysql.