Using capitals in my username?

During installation of Ubuntu 10.04 I was not allowed to use capitals in my Username. Is there any way I could change this?

Solution 1:

Adding new usernames in capital:

• By default capitals are not allowed in usernames.

• You can use --force-badname to create a username in capital.(or you have to reconfigure NAME_REGEX in /etc/adduser.conf)

  sudo adduser <username> --force-badname
  i.e
  sudo adduser JOHN --force-badname

Renaming your username in capital:

• To rename your username in capital,first you have to edit /etc/adduser.conf and add the following line NAME_REGEX=[A-Z,a-z,0-9] to the end of the file.

• And now you can rename your username with capital letter.

• Also if you want to add a new user now,you dont want to use --force-badname,because we have added a new expression in adduser.conf.

• And so you can simply add a new username with capital letter as,

  sudo adduser <USERNAME> i.e sudo adduser JOHN

NOTE:

• However i wouldn't suggest using capitals in a case sensitive OS.
• Use it in your own risk.