Have a look in the airport on arrival for an info office, In Sami ask in ferry ticket/tourist offices they may have a timetable, or ask in a central taverna/cafe. Sometimes buses connect with ferry arrivals/departures to Patras.
The bus station in Argostoli has printed timetables, so you can get one there for sure.
They won't be very frequent about 4 a day, and a couple to Fiskardo.
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