In order to connect a MinION Mk1B to a laptop/desktop that only has a USB-C receptacle, you will need to purchase a USB-A (female) to USB-C adapter that supports USB superspeed (5 Gbps) or faster. The following is a non-exhaustive list of adapters that have undergone internal validation and have be tested certified by the USB implementers forum (USB-IF certified).
Compatibility with your own compute is not guaranteed.