Workaround:
After further investigation, I found that in my case the popup was triggered by
xiccd, which was automatically launched during session startup (XFCE in my
case).
xiccd attempts to interact with the system color management daemon (colord),
which in turn requests elevated privileges through Polkit — resulting in the
authentication popup.
To fix this cleanly, I added the following JavaScript-based Polkit rule,
which works on modern systems using /etc/polkit-1/rules.d/:
/etc/polkit-1/rules.d/20-disable-colord.rules
polkit.addRule(function(action, subject) {
if (action.id.startsWith("org.freedesktop.color-manager.")) {
return polkit.Result.NO;
}
});
This workaround finally made the startup clean again — no more mystery
prompts asking for root without context. This workaround does not solve
the root problem, this rule blocks all actions coming from colord or
anything trying to use color profile management (including xiccd).
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https://bugs.launchpad.net/bugs/1871593
Title:
User receives prompt on login: "Authentication is required to create a
color managed device"
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/colord/+bug/1871593/+subscriptions
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