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New root password not stored after passwd change, F20

I am using Fedora 20, which came installed with my machine. I have access to root privileges via the command line and sudo, which allows me to use my own user's password. However, my root password itself is not working.

I have recently moved offices and would like to use the system configuration window to, for example, set up the network printer and do other such things which are much easier via the GUI than from the command line via sudo. These tasks require "Authentication" via the root password. At some point it seems that my root password has stopped being recognised. At first I thought I'd just forgotten it, but I no longer think that is the issue.

I have used the steps outlined in eg http://fedoraproject.org/wiki/How_to_reset_a_root_password to reset the root password, as well using the more straightforward command line version "sudo passwd" (since I know my own password, sudo works fine in general). Both these appear to work and passwd tells me that the password has been changed. However, when I try to log in as root (even using the KDE safe option, rather than GNOME, in case the graphical interface is a problem?) or try to "Authenticate" in the system configuration window I get the message "Sorry, that didn't work. Please try again."

From other posts online I wonder if there is some read-only setting somewhere that could be the issue, but I would strongly prefer not to break something by experimenting with configuration files that cannot be unbroken.

New root password not stored after passwd change, F20

I am using Fedora 20, which came installed with my machine. I have access to root privileges via the command line and sudo, which allows me to use my own user's password. However, my root password itself is not working.

I have recently moved offices and would like to use the system configuration window to, for example, set up the network printer and do other such things which are much easier via the GUI than from the command line via sudo. These tasks require "Authentication" via the root password. At some point it seems that my root password has stopped being recognised. At first I thought I'd just forgotten it, but I no longer think that is the issue.

I have used the steps outlined in eg http://fedoraproject.org/wiki/How_to_reset_a_root_password to reset the root password, as well using the more straightforward command line version "sudo passwd" (since I know my own password, sudo works fine in general). Both these appear to work and passwd tells me that the password has been changed. However, when I try to log in as root (even using the KDE safe option, rather than GNOME, in case the graphical interface is a problem?) or try to "Authenticate" in the system configuration window I get the message "Sorry, that didn't work. Please try again."

From other posts online I wonder if there is some read-only setting somewhere that could be the issue, but I would strongly prefer not to break something by experimenting with configuration files that cannot be unbroken.