Oliver Hartkopp

I was not aware about this blocking read in a multithreaded environment. So I googled it for myself and found this: https://stackoverflow.com/questions/16637086/linux-cancel-blocking-read I don't know if this is a general...

Thanks for the hint! I'll take a look at it.

Are you sure? `make modules_install` automatically runs `depmod` and I can find `extra/net/can/can-isotp.ko: kernel/net/can/can.ko` at the end of /lib/modules/5.6.0-rc1/modules.dep

I would just remove `extra/net/can/can-isotp.ko`, run `depmod`again and then grep for 'isotp' in modules.dep if is really removed. But I don't know if this is the 'right way'(TM) :-)

`Operation not permitted` -> you need to be root (admin user) ; alternatively use `sudo insmod ...`

Can you check with `dmesg` what the kernel log tells you about the failure? This is often more detailed then just `Operation not permitted` :-)

Did `modprobe can-isotp` return without errors?

Hello Andy, thanks for the documentation! I looks like the `dkms` install really brings the keys to be able to sign the own modules. Good to know!! I was too...

> Did you actually test installing `dkms` ... ? No. In fact I have only one Laptop which supports secure boot and I have to preserve the setup there. >...

You can obviously file Ubuntu problems of this type in Ubuntu Launchpad https://launchpad.net/ubuntu : Like this one: https://bugs.launchpad.net/ubuntu/+source/curtin/+bug/1878115 :-D