It happened that I added the Bianca repository to get MintMenu. After a couple of days the update notifier gave me an error. Maybe important telling you that I still run Barbara as OS.
It was impossible to make the upgrade from the notifier and also from synaptic I had an error message;
it said that the upgrade cannot be done because there where damaged packages, but if I made "repair damaged packages" it gave an error like "locked packages" (I'm sorry for the translation from italian).
I disabilited the Bianca repository and the upgrade notifier works correctly.
But now I notice another strange thing: the packages marked with the Bianca repo. activated were something about OpenOffice, but the upgrades I found after the deactivation of the repo. are something different...
What has happened?