解决Enter password to unlock your login keyring

solution comes from: http://www.cnblogs.com/limei/archive/2011/04/25/2028595.html

The simple command line way to do it is to remove the ~/.gnome2/keyrings/login.keyring.

In GUI way:

Step-1: Ubuntu main menu -> Applications -> Accessories -> Passwords and Encryption Keys

Step-2: In Passwords tab, right click Passwords: login. In the menu select Change Password… option.