Installing SDKmanager on Ubuntu

• install android-sdk

    sudo apt-get install android-sdk

• Set environment variable ANDROID_HOME

    export ANDROID_HOME=/usr/lib/android-sdk

• Download command-line tools
• Extract the command-line tools to a directory
• Move the command-line tools folder

    sudo mv cmdline-tools $ANDROID_HOME

• Set environment variable for the bin folder in the cmdline-tools 

    export PATH=$ANDROID_HOME/cmdline-tools/bin:$PATH 

• Run sdkmanager to test