Is there any way I could use my Android phone (rooted) as a wireless adapter for my Ubuntu desktop? Or share the data connection?
edit: Is there any full free ones?
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Easy Tether allows you to use your Android phone as the network device for Ubuntu. I have used it with both 3g and wifi providing the connection on the Android.
No need for root.
Has a free trial - no ssl allowed in trial.
Barnacle Wifi Tether may work for your (unstated) phone model. It is free with a companion toggle widget for the home screen available. Rooted phone required, as you've stated you have.
The app hasn't been updated in 18 months, but back when I needed this functionality, I found the developer to be extremely helpful. Barnacle is now open source, and not in active development.