How can I get a communication with CAN bus using the SPI pins

I followed the previous tutorials given in this forum but my jetson nano doesn’t recognize the can device ( i with a jetson nano, Ubuntu 20.04, using an MCP2515 CAN transceiver) .
How can I get a CAN communication?
(I cant down grade the OS to Ubuntu 18 'cause i need it for ros2)

what tutorials?
Have you upgraded the kernel to get Ubuntu 20.04 work?

I am using a custom version of ubuntu 20 for jetson nano (it’s not the official one since it’s not available yet)
and these are the tutorials that I followed