How to turn an administrator user account into a standard one?

Question

I have two administrator user accounts, and I need one of them to turn the other into a standard account.

How do I do that?

http://askubuntu.com/questions/45035/disable-sudo-permission-to-user-from-command-line will remove the user from the admin group and disable sudo privileges. — adempewolff, Jun 12 '12 at 05:38
I usually have two admin accounts on each of my systems for the emergency case when of them may have login issues. — Takkat, Jun 12 '12 at 07:18

score 7 · Accepted Answer · edited Apr 13 '17 at 12:24

Search for user accounts in System settings , there you will get window like this

enter image description here

Now select the account you want to change to Standard One, Unlock it from the Upper right button which will ask for password.

Now selecting the Account type Button ( refer image) , you will get option as Standard. It will again ask for password . Now it is done.

For Doing it through Command Line Refer the link provided by adempewolff in the above comment.

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