Is it possible that a European country can have a civil war?

It did recently already happen in Ukraine. The war started with a civil war between Ukrainians and Ukrainian Russians. Later Russia invaded it.

Outside that, the Balkan did got civil wars, like the Serbs against Bosnians and the fall of Yugoslavia.

At this moment there is no possibility for a civil war within the European Union and UK, but in the future there are regions which can have a civil conflict:

1. Catalonian against Spain.
2. Andulisian against Spain.
3. Galician against Spain.
4. Asturian against Spian.
5. Baskian against Spain.
6. Irish against North Iris.
7. Pro-Russian Polish against pro-Western Polish.
8. Northern-Cyprus against Cyprus.

That are the only possible regions which can have a civil war/fight, because there is no underlayer in other regions. Also a war between 2 European Union/British countries are seen as impossible.

The only countries which can be on short terms be like Ukraine are Moldavia and Turkey: Moldavia can get involved in Ukrainian civil war and Turkey can get a civil war between religions, races and political opinions.