ubuntu errori sources.list

[max@mail.studiomasson.it]

Allora, ho aggiornato a breezy anche il portatile, e come dall'altra 
parte tutto bene a parte le icone "mozzate" in gnome.

Oggi ho riprovato a dare un sudo apt-get update, ottenendo questo errore:

> massimo@archimede:~$ sudo apt-get update
> Get:1 http://security.ubuntu.com breezy-security Release.gpg [189B]
> Hit http://security.ubuntu.com breezy-security Release
> Get:2 http://it.archive.ubuntu.com breezy Release.gpg [189B]
> Get:3 http://it.archive.ubuntu.com breezy-updates Release.gpg [189B]
> Hit http://security.ubuntu.com breezy-security/main Packages
> Hit http://it.archive.ubuntu.com breezy Release
> Hit http://security.ubuntu.com breezy-security/restricted Packages
> Hit http://security.ubuntu.com breezy-security/main Sources
> Hit http://security.ubuntu.com breezy-security/restricted Sources
> Hit http://it.archive.ubuntu.com breezy-updates Release
> Ign http://it.archive.ubuntu.com breezy-updates Release
> Hit http://it.archive.ubuntu.com breezy/main Packages
> Hit http://it.archive.ubuntu.com breezy/restricted Packages
> Hit http://it.archive.ubuntu.com breezy/main Sources
> Hit http://it.archive.ubuntu.com breezy/restricted Sources
> Hit http://it.archive.ubuntu.com breezy/universe Packages
> Hit http://it.archive.ubuntu.com breezy/universe Sources
> Hit http://it.archive.ubuntu.com breezy-updates/main Packages
> Hit http://it.archive.ubuntu.com breezy-updates/restricted Packages
> Hit http://it.archive.ubuntu.com breezy-updates/main Sources
> Hit http://it.archive.ubuntu.com breezy-updates/restricted Sources
> Scaricato 191B in 0s (236B/s)
> Lettura della lista dei pacchetti in corso... Fatto
> W: GPG error: http://it.archive.ubuntu.com breezy-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
> W: È consigliabile eseguire apt-get update per correggere questi problemi
> massimo@archimede:~$

Però ieri quando avevo fatto il dist-upgrade non me lo aveva dato.
Come mai???

Il mio sources.list attuale è:

> massimo@archimede:~$ cat /etc/apt/sources.list
> deb cdrom:[Ubuntu 5.04 _Hoary Hedgehog_ - Release i386 (20050407)]/ hoary main restricted
> 
> 
> deb http://it.archive.ubuntu.com/ubuntu breezy main restricted
> deb-src http://it.archive.ubuntu.com/ubuntu breezy main restricted
> 
> ## Major bug fix updates produced after the final release of the
> ## distribution.
> deb http://it.archive.ubuntu.com/ubuntu breezy-updates main restricted
> deb-src http://it.archive.ubuntu.com/ubuntu breezy-updates main restricted
> 
> ## Uncomment the following two lines to add software from the 'universe'
> ## repository.
> ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
> ## team, and may not be under a free licence. Please satisfy yourself as to
> ## your rights to use the software. Also, please note that software in
> ## universe WILL NOT receive any review or updates from the Ubuntu security
> ## team.
> deb http://it.archive.ubuntu.com/ubuntu breezy universe
> deb-src http://it.archive.ubuntu.com/ubuntu breezy universe
> 
> deb http://security.ubuntu.com/ubuntu breezy-security main restricted
> deb-src http://security.ubuntu.com/ubuntu breezy-security main restricted
> 
> # deb http://security.ubuntu.com/ubuntu breezy-security universe
> # deb-src http://security.ubuntu.com/ubuntu breezy-security universe
> massimo@archimede:~$

(si, ho ancora il cd di hoary...)

Ciao e grazie,
Max.