Ah! The log always contains as the only entry:
"(unity-settings-daemon:13702): color-plugin-WARNING **: failed to
connect to device: Failed to connect to missing device
/org/freedesktop/ColorManager/devices/cups_Hewlett_Packard_HP_LaserJet_Professional_P_1102w"
I have a printer of that type (color uncalibrated, as it's a B&W laser)
** Changed in: unity-control-center (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1325673
Title:
Color profile choice not being saved
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