USB CAN adapters can show as follows on Linux.

A serial port appears. slcand can talk to it.

A can network device appears. e.g. can0, shown by ifconfig.

Manually set bitrate for NMEA2000 (prob not normally needed):

ip link set can0 up type can bitrate 250000

https://www.kernel.org/doc/html/v5.11/networking/can.html

CANable is a USB - CAN interface using an STM32F072. CANable firmware does slcan. candleLight firmware does Linux native / SocketCAN.