Ubuntu: "Unlock login keyring" message "the password you use to log in your computer no longer matches that of your login keyring"

Resetting all the keyring passwords:

Navigate to Places > Home. Press ctrl h to view "hidden files". Navigate to .gnome2 > keyrings and delete login.keyring

Using the same keyring (resetting keyring password but keeping old passwords in keyring):

1) Make a backup of the keyring

cd ~/.local/share/keyrings/
cp login.keyring login.keyring.backup

and after that delete login.keyring file

rm ~/.local/share/keyrings/login.keyring

2) Create a new keyring file from Gnome Keyring with the name "login"

3) Replace the new keyring file with the backup of the old keyring file

cd ~/.local/share/keyrings/
mv login.keyring.backup login.keyring

Note: before Ubuntu 12.10 the path to the keyrings folder was ~/.gnome2/keyrings/ instead of ~/.local/share/keyrings/

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