denied execution of stop/start mysql

[nmarasoiu]

Configuring mysql-server-5.5

While not mandatory, it is highly recommended that you set a password for the
MySQL administrative "root" user.

If this field is left blank, the password will not be changed.

New password for the MySQL "root" user:
Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111.
invoke-rc.d: policy-rc.d denied execution of stop.
invoke-rc.d: policy-rc.d denied execution of start.
Setting up libhtml-template-perl (2.95-1) ...
Setting up tcpd (7.6.q-25) ...

tu0.14.04.1) ...
Setting up mysql-server-core-5.5 (5.5.44-0ubuntu0.14.04.1) ...
Setting up psmisc (22.20-1ubuntu2) ...
Setting up mysql-server-5.5 (5.5.44-0ubuntu0.14.04.1) ...
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (This frontend requires a controlling tty.)
debconf: falling back to frontend: Teletype

Setting up supervisor (3.0b2-1) ...
invoke-rc.d: policy-rc.d denied execution of start.