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Turn on electric pressure cooker or Instant Pot to Saute Mode. Add butter and allow to melt; add kielbasa and onions. Saute for 3-4 minutes or until lightly browned.
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Add potatoes, cabbage, and sweet corn in order.
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Mix together water, vinegar, sea salt, red pepper flakes and black pepper. Pour over veggies/kielbasa.
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Cover, and seal. Turn on cooker to high pressure for 4-5 minutes. (I recommend checking the instruction manual for your instant pot to see how many minutes they recommend for potatoes.)
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Release pressure using the quick pressure release.
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Uncover and check for doneness of vegetables. If additional time is needed to cook, use the simmer mode.
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Tastes great with crusty bread.