Dialog box prompting to enter the password on startup

You are using gnome-keyring (vault passwords for programs). Login to gdm unlocked base gnome-keyring, and if autologin base gnome-keyring to unlock accounts manually after autologin.

You can disable the use of gnome-keyring in programs that store passwords in it. Or change to another method of storing passwords in these programs (eg: base64 or plain)

This is happening because your login password and the password for gnome-keyring is not matching. You might have changed the password of your user account.

You can resolve this in two ways:

1). If you know your old password, Reset the password of gnome-keyring to current password of your user account.

2). Delete the existing keyring.

To do these open a terminal and type the command seahorse. A window will open where you can manage the gnome-keyring and other keys. Under the 'Passwords' tab right click on the 'Passwords:login'. A menu opens and you can find both options (Change password and delete).

You can also delete the application that causing the error from the keyring list