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You need to break those bubbles - remove what comes off - let it dry out for a while - then spackle - prime - and paint.
I would recommend after you spackle and sand - use a shellac primer (B-I-N is a good one). Then two coats of oil based semi-gloss. While I don't usually recommend alkyds - they are much more water resistant than latexes.
Make sure that you leave plenty of time to di this - don't have a hot shower in there until the paint is dry - 16-24 hours.