Two quick housekeeping hacks.
1. If you use Skype under Ubuntu and cannot log in with the error message ‘another instance may exist’, you should check your permission at ~/.Skype. They’ve probably been fubared when you last ran Skype as root (which you really shouldn’t.. yes yes, I know).
2. If you get the kdewallet error (error -9, cannot read, possibly wrong password). You can simply delete your .kwl file at ~/.kde/share/apps/kwallet
The next app you try and run will ask you for a password. When you type your password, it’ll be saved to your new keyring.