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Downgrading Java on Ubuntu 16.x 
Just a quick note to let everyone know that - after installing LTS 16.04 (so far a very pleasant & stable release - recommended!) that I discovered that the default JDK ("9 internal") does not work.

java -version
openjdk version "9-internal"

--The failures are so bad, that the kernel actually dumps core!

(Forgive the imp, yet note the bug -Halloween is around the corner!)

Sadly, removing the "9 internal" by conventional means results in only a partial removal... very nasty. What will work however, is to remove everything via a hand-grenade:

sudo apt remove --purge "^openjdk.*"

Followed by a dependency purge:
sudo apt-get autoremove

Then re-install a version that actually works:
sudo apt-get install openjdk-8-jre

Ultimately, once we have what we need installed, don't forget to associate that new JRE by right-clicking on a .jar file, so as to:

In addition to those old 'ol reliable versions of Oracle (I like to test under many JVM's), here is the OpenJDK that worked for me on LTS 16.04.1:
openjdk version "1.8.0_91"
OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-3ubuntu1~16.04.1-b14)
OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)

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Installing MySQL Server & Workbench 
In a previous article we praised the innovative way Red Had allows us to rapidly install things like MySQL.

For the new learner however, note that at the time of this writing that only the MySQL Client (mysql-client) toolset will be installed.

Service, Please

If you are looking to do some R&D on your local host (we use a Virtual Box), then one will want to also install the MySQL Server tools (mysql-server), as well:

yum install mysql-server

Thereafter (*) we can start the locus via:

service mysqld start

As well as subsequently begin the MySQL console interface simply by typing
at the console interface.

MySQL Workbench

For those of us who absolutely love Microsoft SQL Server's SQL Management Studio (SSMS), note that MySQL has a must-have graphical tool set, as well. Formerly known as "MySQL Administrator", we now call it the "Workbench."

No matter what we call it however, the Community Edition of the GUI is the very next item most R&D folks will want to download.

Again at the time of this writing however, there is often an installation caveat. Before installation, try
yum install ... x86_64.rpm
if you run into problems whilst doing something like
yum install mysql-workbench-community-6.1.7-1.el6.x86_64.rpm
Once installed, merely enter
at the console to get things rolling.

Google Fodder

Installing the MySQL Server will resolve error message such as:
Error: Package: mysql-workbench-community-6.1.7-1.el6.x86_64 (/mysql-workbench-community-6.1.7-1.el6.x86_64) Requires:

[ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

-as well as:
mysqld: unrecognized service

or someday perhaps even:
mysqld: unrecognised service  ;-)

Ubuntu & Elsewhere

(*) Note that Ubuntu learns will want to use
sudo apd-get install mysql-server
sudo service mysqld start
rather than
yum ...
. Otherwise, everything else in this post will work the same.

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