Root user cannot read /root

Question

I added a user called 'kma' to root group. Then I changed permission of /root/ to 770. Which should give the user read, write and execute access since I added him to the root group. But it still gives permission denied error. What am I doing wrong here?

Commands I executed:

sudo adduser kma root
sudo chmod 770 /root/
cd /root/ <------- Gives permission error

Answer 1

You probably need to open a new shell. The current shell won't automatically have the new group. Log out and back in, or run exec bash.