install JDK and Android SDK on Linux Ubuntu

install-android-sdk-in-ubuntu.md

install openjdk

sudo add-apt-repository ppa:openjdk-r/ppa

sudo apt-get update

sudo apt-get install openjdk-8-jdk

download android sdk

wget https://dl.google.com/android/repository/tools_r25.2.3-linux.zip

unzip tools_r25.2.3-linux.zip -d sdk

cd /sdk/tools

install all sdk packages

./android update sdk --no-ui

set path

export ANDROID_HOME=$HOME/sdk

export PATH=${PATH}:$ANDROID_HOME/platform-tools:$ANDROID_HOME/tools:$ANDROID_HOME/build-tools/26.0.0-preview/

adb

sudo apt-get install libc6:i386 libstdc++6:i386

aapt

sudo apt-get install zlib1g:i386

Open Android SDK Manager to check installation

android

Thanks for good instruction.
I think cd /sdk/tools this part should update as cd ./sdk/tools i think you miss a dot :)