authentication

[Barry <b wallis5 bigpond com>]

hi My daughter has misplaced and cannot remember the password for the
authentication aspect. We wanted to upgrade ubuntu and also install
Skype but without this authentication password we are stumped. how can
we find/cancel/reset this problem. Unfortuneatley i sent you an email
from her machine and she cannot find the email password. Stop laughing
as i am a bit more organised than that.
sincerely
barry (dad)