My Ubuntu 12.04 install suddenly started to display following message: "the login keyring did not get unlocked when you logged into your computer" after each time I boot my computer. It did not do this before today (or yesterday? Can't remember but it is definitely a recent change) and I have not changed any account configurations or passwords, I never had automatic login enabled where you would expect such behavior.

Do you have any idea what caused it and how I can fix it? Is it possibly a bug I should report?

Thanks for your replies in advance