Failure in Ubuntu 20.04

[buuth]

Thank you for your plugin, however it does not work in Ubuntu
dmidecode -s system-uuid
/sys/firmware/dmi/tables/smbios_entry_point: Permission denied
/dev/mem: Permission denied

My fix is
if(buf[0] == 0) {
rstream = popen("cat /etc/machine-id", "r");
fread(buf, sizeof(char), sizeof(buf), rstream);
pclose(rstream);
}