Thank you so much for the help.
Now everything work.
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to policykit-1 in Ubuntu.
https://bugs.launchpad.net/bugs/1643931
Title:
Security problem with Super User Authorization
Status in policykit-1 package in Ubuntu:
Invalid
Bug description:
luca@pc-sala:~$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
luca@pc-sala:~$
luca@pc-sala:~$ apt-cache policy sudo
sudo:
Instalados: 1.8.16-0ubuntu1.2
Candidato: 1.8.16-0ubuntu1.2
Tabla de versión:
*** 1.8.16-0ubuntu1.2 500
500 http://pe.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
100 /var/lib/dpkg/status
1.8.16-0ubuntu1 500
500 http://pe.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
luca@pc-sala:~$
On my system I have 3 accounts (me, my wife and my son), My account is the
only that can use SUDO, the others are desktop users.
I need to limit the access to my son (5 years old), so I had to put the
password to my login, but my password was very strong: large and complicate.
Otherwise I need to use sometimes SUDO (truecrypt, rsync with other devices,
etc.).
In order to simplify my login and keep the ability to use SUDO I activated
the "targetpw" flag in sudoers, so now my login password is quite easy and ROOT
account has the strong password.
It works, programs like synaptic, sudo, gksu and others accept the root
password, but I found a very very strange behaviours in some programs, for
example:
a) users-admin
b) gnome-language-selector
c) lightdm-gtk-greeter-settings-pkexec
Those programs perform admin tasks and I suppose that when they ask for the
password authorization they need the root password.
No! They want my personal account password, the root password is not accepted.
I think that this is not right, because my system now has a security
weakness, and I don't know how many other programs have the same
behaviour. This could be a serious security breach.
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