You can also use your mouse scroll wheel to adjust screen brightness by scrolling up/down. To install the Brightness indicator on Ubuntu 11.04, download the deb package here and double-click it to install it.
After installing this indicator, open the Terminal and launch it with this command:
To start it automatically at Ubuntu startup, then follow these instructions:
1. Open the dash and open Startup Applications.
2. Click the Add button and add the following parameters:
- Name: Screen Brightness
- Command: /opt/indicator-brightness/indicator-brightness.py
- Comment: Optional
Then click Add
3. From now on, the indicator will start automatically at Ubuntu startup. If you want to create a shortcut for it, then use the same command given above.