sudoers

Allowing more: (http://ubuntuguide.org/#allowmoresudoers)

export EDITOR=nano && sudo visudo
Append the following line at the end of file
system_username ALL=(ALL) ALL

or

system_username ALL=(ALL) NOPASSWD: ALL

if require no password.

Save the edited file (sample)

Adding a user account to sudoers: (http://www.unixcities.com/sudo/)
mike ALL=(root) ALL

(expert install of Kubuntu didn't add user to sudoers, for some reason?)

Unrelated bug when changing the system time: can only open up the time/date control panel via Terminall ... sudo kcontrol.