#vagrant start relevant output
==> one: Setting up mysql-server-core-5.6 (5.6.27-0ubuntu0.14.04.1) ...
==> one: Setting up mysql-server-5.6 (5.6.27-0ubuntu0.14.04.1) ...
==> one: start: Job failed to start
==> one: invoke-rc.d: initscript mysql, action "start" failed.
==> one: dpkg: error processing package mysql-server-5.6 (--configure):
==> one:  subprocess installed post-installation script returned error exit status 1

#then i ssh into the box and start it manually....

# /etc/init.d/mysql start
 * Starting MySQL database server mysqld
No directory, logging in with HOME=/
-su: 31: source: not found
   ...done.
 * Checking for tables which need an upgrade, are corrupt or were
not closed cleanly.