[Banshee-List] Problem 1.4 installation on Heron

[LXian <samaris gmail com>]

Hello,

I wanted to install 1.4 and followed this :
-----------------------------------------------------------
This PPA contains the latest debs of Banshee for Ubuntu. To install Banshee,
you must first enable the PPA on your system:
1. Open Software Sources (System->Administration->Software Sources)
2. Navigate to the "Third Party Sources" tab.
3. Click "Add"
4. Enter the APT line below that corresponds to your Ubuntu version that
starts with "deb".
5. Click "Add Source"
6. Click "Close"
7. It will prompt you to reload your software cache. Click "Reload".
-----------------------------------------------------------------------------------------------

Could not reach step 8 because i get this message :
W: GPG error: http://ppa.launchpad.net hardy Release: Les signatures
suivantes n'ont pas pu être vérifiées car la clé publique n'est pas
disponible : NO_PUBKEY 4874D3686E80C6B7
(signatures could not be verified because this public key is not available)

Do i have to uninstall previous version (0.13.2) first?
Anything else?
Thank you for your help

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