Linux desktop users specifically don't have to worry about malware or ransomware until it gets significant usage. Just like people used to say Macs don't get viruses until enough people used them.
Last time I checked (could be very out of date) Linux doesn't have any way to enforce code signing requirements, even in the kernel.
Last time I checked (could be very out of date) Linux doesn't have any way to enforce code signing requirements, even in the kernel.