[Solved] user is not allowed to execute as root

[f1vefour]

(25th Jul, 2013 05:07 AM)rikardo1979 Wrote:  use to have had same issues and after two weeks of pulling my hair of I found it was caused by USB cable from PSU.I use same PSU with different cable and no issues.
Worth to try

+1

These new issues definitely sound like a power issue.

Check the /etc/sudoers as mentioned.

Unplug the powered hub and all accessories (except keyboard) including the LAN cable and see if your Pi will allow you to run 'sudo ls'.

If no, unplug the keyboard and plug in the LAN cable and try sudo over SSH. If still no sudo, reboot (still no accessories except LAN) and SSH in and try sudo one last time.

It may be a hardware conflict with the keyboard or a button on the keyboard is stuck (flip it over and tap it against something).