Comment 3 for bug 1413450

Hi Lê, and thanks for reporting this bug. I'm afraid that something is wrong with your disk filesystem; maybe the upgrade didn't complete successfully or some files got deleted. Can you please check from a terminal if "sudo apt-get dist-upgrade" gives you some package to install?
Also, in order to check the integrity of the accounts database, please run the following command:

    sqlite3 ~/.config/libaccounts-glib/accounts.db

and then, at the sqlite3 prompt, type

    select * from Accounts;

and see if your accounts are still there. You can also use the "account-console list" command to get a list of your accounts.