CAN-shield with MCP2515 on Raspberry Pi 4 B with Ubuntu
For ubuntu the boot partition is mounted under /boot/firmware with 3 files: config.txt, syscfg.txt, and usercfg.txt. The usercfg.txt is included by config.txt and is recommended to bearing user customized configuration. So saving your lines in usercfg.txt instead should make it works
usercfg.txt
ifconfig
candump by can-utils
Unable to connect RC522 RFID module to Raspberry Pi 4
I found out the simple answer. just reinstall the Raspbian OS to reset the SPI configuration (which was set for 3.5 inch LCD) so RFID writing and reading work well and everything goes correct.
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