Took weeks to find a solution to this error.
After upgrading to Ubuntu 9.04 Jaunty, upon startup I kept getting the following error:
Enter password for default keyring to unlock
The application ‘NetworkManager Applet’ (/usr/bin/nm-applet) wants access to the default keyring, but it is locked.
- Right-click on the wireless applet in the task bar
- Find your wireless connection, and hit Edit.
- Check the option “Available to all users”.
Thanks to tentwelveight for uncovering the answer.