Re: [arch-general] help

and then I use “systemctl enable dhcpcd@ ” hoping to reset the Internet connection but the shell tells me“ Fail to issue method call:Read-only file system”

You need to do 'systemctl enable dhcpcd@interface_name' substituting the interface_name with your network device like eth0. Do you get the read-only filesystem error anywhere else, as that would suggest your root-fs is mounted in read-only mode. Can you post your fstab?