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The same process applies whether the person is incarcerated or not. You can file a complaint for divorce and he'll be served with process in jail. Because he can't appear, the court will allow some accommodations for him and allow him to respond in writing or via telephone/video conference.
If you get an attorney to assist you, it won't be any problem.
You'll send the divorce papers to him with a summons to his jail. The officers will get the documents to him and have him sign in the presence of a notary. There should be more than one notary at the facility.