Failed to install the following Android SDK packages as some licences have not been accepted.
build-tools;28.0.3 Android SDK Build-Tools 28.0.3 platforms;android-28 Android SDK Platform 28 If you stumbled upon the same error, then you could try these:
You could find your sdkmanager executeable in linux by
$ locate sdkmanager
$ find / -name "sdkmanager"
Hope it helps.