Using gparted (which requires root access to the block storage devices) "test" user fails whilst original "lubuntu" user is successful:
# In "lubuntu" user's GUI terminal emulator: lubuntu@lubuntu:~$ gparted localuser:root being added to access control list ====================== libparted : 3.2 ====================== localuser:root being removed from access control list # In "test" user's GUI terminal emulator: test@lubuntu:~$ gparted localuser:root being added to access control list Error executing command as another user: Not authorized This incident has been reported. localuser:root being removed from access control list -- 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/1828663 Title: policykit failures due to internal user id mismatch Status in PolicyKit: Unknown Status in lubuntu-meta package in Ubuntu: Invalid Status in lxqt-policykit package in Ubuntu: Invalid Status in policykit-1 package in Ubuntu: Confirmed Status in polkit-qt-1 package in Ubuntu: New Bug description: After adding a second user to the sudo group any authentication in the QT applications menu fails, till I manually remove the second user from the sudo group by issuing deluser chiara sudo in terminal window. Lubuntu 19.04 (fresh install, in italian) 1)open the preferences/LXQt settins/user and groups menu from the application menu 2)add new user, before saving add it to sudo group; save (password asked for user currently logged on, as expected - then new user password asked, user created -all ok) 3)restart system 4) log in as newly created user; open the same interface preferences/LXQt settins/user and groups; try changing the full name field (properties of your own user): logged user password asked (and... why? User two is changing himself) 5)popup showed: "Error executing command as another user: Not authorized" & user unchanged. 6)if you exit session, reenter with the first user, also him is now unable to use interface ti change users via interface 7)using terminal, delete second user from sudo group 8)restart system 9)athenticated interface working again. It happened me both at home on a phisical laptop and on a virtual machine at office, where I could do it all twice. By the way, also plasma-discover tells me I haven't the right to update/install when I have two sudoers (tried at home to remove second sudoer to fix it, and it worked) So it seems that the authentication mechanism of the QT graphical interface fails when there are more then one sudoer on the system - but only for applications started from the application menu. Launching the same application via terminal (sudo plasma-discovery) works. commands issued by the interface (which lead to "unauthorized" error: --change user pkexec --disable-internal-agent lxqt-admin-user-helper usermod -c marco marcop --plasma-discover polkit-agent-helper-1 marcop To manage notifications about this bug go to: https://bugs.launchpad.net/policykit-1/+bug/1828663/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp