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Para agregar variables de entorno
gedit .bashrc 
JAVA_HOME=/usr/lib/jvm/jdk1.8.0_181
NODEJS_HOME=/usr/local/lib/nodejs/node-v8.12.0-linux-x64
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin:$NODEJS_HOME/bin
export JAVA_HOME
export NODEJS_HOME
export PATH

Config JDK para actualizarlo de openjdk
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_181/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0_181/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.8.0_181/bin/javaws" 1
sudo update-alternatives --set java /usr/lib/jvm/jdk1.8.0_181/bin/java

sudo aptitude install git
git config --global user.name "UserName"
git config --global user.email "email@email.em"

sudo cp libpepflashplayer.so /usr/lib/adobe-flashplugin/

sudo dpkg --add-architecture i386

editando repositorios debian contrib non-free
edit /etc/apt/sources.list

deb http://deb.debian.org/debian/ stretch main contrib non-free
deb-src http://deb.debian.org/debian/ stretch main contrib non-free

deb http://security.debian.org/debian-security stretch/updates main contrib non-free
deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free

# stretch-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ stretch-updates main contrib non-free
deb-src http://deb.debian.org/debian/ stretch-updates main contrib non-free

sudo aptitude install firmware-iwlwifi
sudo modprobe -r iwlwifi
sudo modprobe iwlwifi

su
gedit /etc/sudoers

agregar usuario:
# User privilege specification
root	ALL=(ALL:ALL) ALL
usuario    ALL=(ALL:ALL) ALL