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I logged into Ubuntu with guest session account, but the ls command is not permitted even using sudo.

But... why? Any ideas?

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    Maybe your user account not included in sudoers!!
    – shgnInc
    Commented May 4, 2014 at 3:18

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It's because you're not a sudoer. Which is a list of users allowed to use the sudo command.

You can become a sudoer by adding your username to the list of sudoer as root:

  1. Become root by: su and entering root's password
  2. visudo (Brings up a comamndline text editor specifically for editing the sudoers file)
  3. Add this line to the bottom of the list: YOUR_USERNAME_HERE ALL=(ALL) ALL
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    To answer the other half of the question - why isn't ls working? - it's because the guest account doesn't have read permission for the /home directory. By default (reading from an Ubuntu 14.04 LTS VM), only the owner has permission to do anything with the /home directory (its permissions show up as drwx------ for me). This offers a more thorough explanation of file permissions.
    – Pockets
    Commented May 4, 2014 at 4:37

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