Question: I'm new in react-native.
I have run react native project on Ubuntu by using 'react-native run-android' command. And I got the error on emulator 
"Unable to load script from assets 'index.android.bundle'.Make sure your bundle is packaged correctly or you are running a package server."

Answer: 
This helped me resolve the problem in following steps.

* If not than (in project directory) mkdir android/app/src/main/assets
* `react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res`
* `react-native run-android`
It seems to be a problem in the newest version of React Native (0.46). Using the previous version seems to solve the problem `react-native init name --version react-native@0.45.1` and removes the error when running `react-native run-android`.

Edit: It is now fixed in version 0.46.1.