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When I tried adding user through the administrator account - ie User Accounts->unlock-> click + to add account -> account type 'standard' and after adding username and fullname when I click Add I get 

Failed to add account 
running '/usr/sbin/adduser' failed: Child process exited with code 1'
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    Please edit your question and add the full command you have run and the full output you have got..
    – heemayl
    Sep 24, 2015 at 5:02

1 Answer 1

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i think you are using either capital letter , space or some thing different then username rule . try in lower case . use format 

([a-z_][a-z0-9_]{0,30})

you can take help from here if you want to create user with capital then use bellow command to create user 

sudo adduser --force-badname username

or you can change /etc/adduser.conf

#NAME_REGEX="^[a-z][-a-z0-9_]*\$"

to 

NAME_REGEX="^[a-zA-Z][-a-zA-Z0-9_]*\$"

you can change this NAME_REGEX according to your requirement. if still your problem not resolved then open terminal using Ctrl+ Alt+T and run command 

sudo adduser username

Note : try to keep standard naming rules some application or library follow this rules so sometime it may introduce problem.

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  • when I try typing the above commands in terminal window it says I need to be in
    – Neena
    Sep 24, 2015 at 6:40
  • i am not getting . once you run that command then it will ask some basic password , full name etc.
    – pl_rock
    Sep 24, 2015 at 6:50
  • Is there any limitations on adding user account
    – Neena
    Sep 24, 2015 at 7:14
  • @Neena in what sense you are asking limitation . please , share in details. is my answer helped you ? if yes, then you can accept answer by clicking on tick mark in left side of my answer that will be helpful for other who face similar problem. if your problem not resolved then share what error you are getting now.
    – pl_rock
    Sep 24, 2015 at 12:20

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