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I installed Ubuntu 12.10 with the option to log my main user with a password.
Then I added two other users and changed all three accounts to log in without a
password.
This nulled my main user's password and stopped the ability to sudo and make
any system wide changes!
Also the password can not be set back on, as there is no valid password to
authorize any actions! In effect, you are completely left without a super user
for your computer and cannot install updates or programs or do a whole lot of
anything.
There is a remedy to this and it is to go to the terminal and typing
passwd, after which you can re-set your password. However this is not
clear to many users, and that's why the Users panel simply should not be
able to null your password even if you prefer to login without one.
Very critical to get fixed asap!
** Affects: gnome-control-center (Ubuntu)
Importance: Undecided
Status: Confirmed
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"Login without password" option effectively locks super user out!
https://bugs.launchpad.net/bugs/1070449
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