authentication is required to create a color profile

I found this bug and some workarounds here:

https://bugzilla.redhat.com/show_bug.cgi?id=1149893

More specific you have to place a .rules file in

/etc/polkit-1/rules.d/

(Select a filename and just givr the .rules extension)

and give the rules:

polkit.addRule(function(action, subject) {
   if ((action.id == "org.freedesktop.color-manager.create-device" ||
        action.id == "org.freedesktop.color-manager.create-profile" ||
        action.id == "org.freedesktop.color-manager.delete-device" ||
        action.id == "org.freedesktop.color-manager.delete-profile" ||
        action.id == "org.freedesktop.color-manager.modify-device" ||
        action.id == "org.freedesktop.color-manager.modify-profile") &&
       subject.isInGroup("ATTENTION")) {
      return polkit.Result.YES;
   }
});

Then you have to Replace the word "ATTENTION" with your user's group.

I had the same problem and found a different work-around here:

https://github.com/TurboVNC/turbovnc/issues/47#issuecomment-412005377

This variant is claimed to work independent of authentication scheme (e.g. LDAP).

Create /etc/polkit-1/localauthority/50-local.d/color.pkla (note: .pkla extension is required) with the following contents:

[Allow colord for all users]
Identity=unix-user:*
Action=org.freedesktop.color-manager.create-device;org.freedesktop.color-manager.create-profile;org.freedesktop.color-manager.delete-device;org.freedesktop.color-manager.delete-profile;org.freedesktop.color-manager.modify-device;org.freedesktop.color-manager.modify-profile
ResultAny=yes
ResultInactive=yes
ResultActive=yes

Worked for me.

I'm running Windows 10 Remote Desktop Connection to Ubuntu 18.04.4 LTS with xrdp. The following solution from this page worked for me (see section titled How to "fix" this issue):

• delete the file org.freedesktop.color.policy file (located in /usr/share/polkit-1/actions). By deleting this file, you are basically removing the limitations of creating and managing color devices and profiles.

Note that the above is one of two 'not recommended' ways. However, for my little home lab setup, it worked fine with no undesirable side effects that I can see. There are two other recommended solutions that I did not try.