[arch-general] help

[SMR]

Hello.I'm a new users of Archlinux but using Ubuntu for 3 years.


I have installed all the system following the guide of beginner's guide.
and I found I could not ping to google after I reboot my computer however just as 5 minutes before I had just used pacman to install all the packages i needed. 
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”
Does anyone know what's the problem?


Thank you!