You Do Need power plug adapter while traveling from Czech Republic to Cuba.

Here is Why You Need An Adapter

The outlet and plug type used in Cuba are A, B, C and L and in Czech Republic are C and E. This is how they look like.

Czech Republic

In Czech Republic, outlets of type C and E are in use.

Type C

Type E

Cuba

In Cuba, outlets of type A, B, C and L are in use.

Type A

Type B

Type C

Type L