apt-get update problem: GPG error ... The following signatures were invalid

[Noah Dain]

I just tried ( 20:45 EST, gmt -5??) to update my system via 'apt-get
update' and got this:

(@)> apt-get update
Get:1 http://security.ubuntu.com breezy-security Release.gpg [189B]
Get:2 http://us.archive.ubuntu.com breezy Release.gpg [189B]
Hit http://security.ubuntu.com breezy-security Release
Get:3 http://us.archive.ubuntu.com breezy-updates Release.gpg [189B]
Hit http://security.ubuntu.com breezy-security/main Packages
Hit http://security.ubuntu.com breezy-security/restricted Packages
Hit http://us.archive.ubuntu.com breezy Release
Ign http://us.archive.ubuntu.com breezy Release
Hit http://us.archive.ubuntu.com breezy-updates Release
Ign http://us.archive.ubuntu.com breezy-updates Release
Hit http://us.archive.ubuntu.com breezy/main Packages
Hit http://us.archive.ubuntu.com breezy/restricted Packages
Hit http://us.archive.ubuntu.com breezy-updates/main Packages
Hit http://us.archive.ubuntu.com breezy-updates/restricted Packages
Fetched 379B in 0s (379B/s)
Reading package lists... Done
W: GPG error: http://us.archive.ubuntu.com breezy Release: The
following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu
Archive Automatic Signing Key <ftpmaster at ubuntu.com>
W: GPG error: http://us.archive.ubuntu.com breezy-updates Release: The
following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu
Archive Automatic Signing Key <ftpmaster at ubuntu.com>
W: You may want to run apt-get update to correct these problems


oddly enough, running apt-get update again fails to correct the problem ;-)

/etc/apt/sources.list:

deb http://us.archive.ubuntu.com/ubuntu/ breezy main restricted
deb http://us.archive.ubuntu.com/ubuntu/ breezy-updates main restricted
deb http://security.ubuntu.com/ubuntu/ breezy-security main restricted

#deb http://us.archive.ubuntu.com/ubuntu/ breezy universe multiverse
#deb http://security.ubuntu.com/ubuntu/ breezy-security universe multiverse


--
Noah Dain
noahdain at gmail.com