How to upgrade SystemD to 246+ on Ubuntu 20.04?
Solution 1:
This is a high-risk operation since systemd is the start of a long dependency chain.
What you are asking for is basically to turn your Ubuntu 20.04 into a bleeding-edge system with new components on very deep system levels. You'd need a lot of expertise to do that successfully.
Also, are you sure that it's systemd that limits hardware compatibility with that CAN-FD card? Wouldn't that rather be kernel related?