error: permission denied on key提示错误

[Franky1989]

以root权限登录设备，grep过滤查找资料
总会提示:error: permission denied on key


root@ubuntu:~# sysctl -A | grep huge
error: permission denied on key 'vm.compact_memory'
vm.nr_hugepages = 0
vm.hugetlb_shm_group = 0
vm.hugepages_treat_as_movable = 0
vm.nr_overcommit_hugepages = 0
error: permission denied on key 'dev.parport.parport0.autoprobe'
error: permission denied on key 'dev.parport.parport0.autoprobe0'
error: permission denied on key 'dev.parport.parport0.autoprobe1'
error: permission denied on key 'dev.parport.parport0.autoprobe2'
error: permission denied on key 'dev.parport.parport0.autoprobe3'
error: permission denied on key 'net.ipv4.route.flush'
error: permission denied on key 'net.ipv6.route.flush'


是需要设置哪些地方来提升权限？