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$ wget http://www-eu.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
...
2017-08-16 23:45:35 (2.26 MB/s) - ‘apache-maven-3.3.9-bin.tar.gz’ saved [8491533/8491533]

$ tar -zxvf apache-maven-3.3.9-bin.tar.gz
...

$ sudo mv apache-maven-3.3.9 /opt/maven

$ printf 'export M2_HOME=/opt/maven\nexport PATH=${M2_HOME}/bin:${PATH}\n' | sudo tee -a /etc/profile.d/mavenenv.sh

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$ sudo update-alternatives --config java
There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
Nothing to configure.
$ echo 'JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java"' | sudo tee -a /etc/environment
JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java"
$ source /etc/environment

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$ (
> sudo apt-get install default-jre
> sudo apt-get install default-jdk
> )
...
$ java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-2ubuntu1.16.04.3-b11)
OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)

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$ git clone https://github.com/iotaledger/wallet
Cloning into 'wallet'...
...
$ cd wallet
$ git checkout v2.5.6
...

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$ sudo yarn global add electron-builder --dev
...
success Installed "electron-builder@19.22.1" with binaries:
      - electron-builder
...

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$ sudo npm i -g yarn
...
└─┬ yarn@0.27.5

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$ sudo npm i -g bower
npm WARN deprecated bower@1.8.0: ..psst! While Bower is maintained, we recommend Yarn and Webpack for *new* front-end projects! Yarn's advantage is security and reliability, and Webpack's is support for both CommonJS and AMD projects. Currently there's no migration path, but please help to create it: https://github.com/bower/bower/issues/2467
/usr/bin/bower -> /usr/lib/node_modules/bower/bin/bower
/usr/lib
└── bower@1.8.0

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$ sudo npm i -g electron
/usr/bin/electron -> /usr/lib/node_modules/electron/cli.js

> electron@1.7.5 postinstall /usr/lib/node_modules/electron
> node install.js

/usr/lib
└─┬ electron@1.7.5

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$ node -v
v6.11.2

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$ (                                                                                                                                                                       [57/57]
> curl -sL https://deb.nodesource.com/setup_6.x -o nodesource_setup.sh
> sudo bash nodesource_setup.sh
> sudo apt-get install nodejs
> sudo apt-get install build-essential
> )

## Installing the NodeSource Node.js v6.x repo...