Please note that if you haven't changed over to MariaDB - you should ... But more to the point for this post - if you need to reset your root mysql or mariadb password, the easiest way to do it on an Ubuntu platform is to run the following commands: First, you need to know what version of mysql or MariaDB you have, so run this to search for the package name: root@bazingah:/usr/local/bin# dpkg-query -S mariadb-server

Say you want to change the character_set or collation of a MariaDB (MySQL) DB:

ALTER DATABASE databasename CHARACTER SET utf8 COLLATE utf8_general_ci;

I see this fairly often when I have done fast installs of ubuntu:
"Connection for controluser as defined in your configuration failed."

What happens is I ignore the install script that needs to run for PhpMyAdmin to establish its database etc.
Happily the fix is fairly easy - just run the script again now:
sudo dpkg-reconfigure phpmyadmin

I am surprised that there have been no updates to the webmin interface to support the new samba version (that has been rolled out to most major linux distros now) -- am I the only one that has been using webmin to do my admin on samba servers ? I think NOT...

Anyway - here is a quick and dirty fix to the start/stop entries in the webmin samba module to correct it for Version 4:

Command to stop Samba servers
service smbd stop && service nmbd stop

Command to start Samba servers
service smbd start && service nmbd start

Beware people (like me) who offer solutions (like this)...

That said, here is how I have (several times) repaired this error on my HTC EVO 4G LTE.
(it's a Sprint phone, but I think these issues are across all of the telcos)

On your KEYPAD, type this:

Polymer looks like it may be very cool -
https://www.youtube.com/watch?v=yRbOSdAe_JU

I was excited to find this, so I am saving it here.

To change an smb passwd in a bash script:

echo -e "newpasswd\nnewpasswd" | (smbpasswd -s username)

And note the "\n" in there to push a newline between the two passwords...

For the unix (Linux) username:

echo -e "newpass\nnewpass" | (passwd --stdin username)

I have been building a new web server platform and tried to install drush using pear as I have in the past, but it is not NOT the recommended way to install it any longer (who knew?).
Drush has developed a huge cult following for it's ease of use in maintaining multiple drupal based sites very easily from the CLI. I cannot recommend drush highly enough - I can update the code for all of my sites in a few minutes - back in the gory days it would take me ages to do that... These steps worked flawlessly for me on Ubuntu 14.04 today.

You can install the patches (for Ubuntu 12.04 and up) with the following three commands: sudo add-apt-repository ppa:george-edison55/openssl-heartbleed-fix sudo apt-get update sudo apt-get upgrade
Any errors running "add-apt-repository" on Ubuntu 12.04, will probably mean that you need to install the "python-software-properties" package with the following command:
sudo apt-get install python-software-properties