I run docky which is programmed with mono so I think the binfmt is running correctly, but proc-sys-fs-binfmt_misc.automount complains about it, since I don't have /proc/sys/fs/binfmt_misc/CLRI already have CONFIG_BINFMT_MISC=y in my kernel config.
No /proc/sys/fs/binfmt_misc/CLR on my system?
linux;kernel;binfmt
/proc/sys/fs/binfmt_misc/CLR gets created by the kernel when you register a binary format that you've named CLR. Are you able to register one manually?echo ':CLR:M::MZ::/usr/bin/mono:' | sudo tee /proc/sys/fs/binfmt_misc/registerIf this works, then the solution is probably that you should add a file in /etc/binfmt.d; see man binfmt.d for more information.Are you sure systemd is complaining about it not already being there? systemd's systemd-binfmt.service is supposed to do that for you (but I think it does need that config file in order to do it).