invalid GPG key - is this a big problem?

[Tim Smith]

i get this output when I do apt-get update, I am a new user and I am sorry if this is in the wrong place.

I don't know if the GPG error is a serious one, but I am concerned. can anyone explain?

here is the out put from the apt-get command:

root@tim-little-laptop:/var/lib/apt/lists# apt-get update
Get: 1 http://security.ubuntu.com feisty-security Release.gpg [191B]
Ign http://security.ubuntu.com feisty-security/main Translation-en_GB
Get: 2 http://gb.archive.ubuntu.com feisty Release.gpg [191B]
Hit http://gb.archive.ubuntu.com feisty/main Translation-en_GB
Ign http://security.ubuntu.com feisty-security/restricted Translation-en_GB
Ign http://security.ubuntu.com feisty-security/universe Translation-en_GB
Ign http://security.ubuntu.com feisty-security/multiverse Translation-en_GB
Hit http://security.ubuntu.com feisty-security Release
Ign http://gb.archive.ubuntu.com feisty/restricted Translation-en_GB
Ign http://gb.archive.ubuntu.com feisty/universe Translation-en_GB
Hit http://gb.archive.ubuntu.com feisty/multiverse Translation-en_GB
Get: 3 http://gb.archive.ubuntu.com feisty-updates Release.gpg [191B]
Ign http://gb.archive.ubuntu.com feisty-updates/main Translation-en_GB
Ign http://gb.archive.ubuntu.com feisty-updates/restricted Translation-en_GB
Hit http://gb.archive.ubuntu.com feisty Release
Hit http://security.ubuntu.com feisty-security/main Packages
Hit http://gb.archive.ubuntu.com feisty-updates Release
Hit http://security.ubuntu.com feisty-security/restricted Packages
Hit http://security.ubuntu.com feisty-security/main Sources
Hit http://security.ubuntu.com feisty-security/restricted Sources
Hit http://gb.archive.ubuntu.com feisty/main Packages
Hit http://gb.archive.ubuntu.com feisty/restricted Packages
Hit http://gb.archive.ubuntu.com feisty/main Sources
Hit http://security.ubuntu.com feisty-security/universe Packages
Hit http://security.ubuntu.com feisty-security/universe Sources
Hit http://security.ubuntu.com feisty-security/multiverse Packages
Hit http://security.ubuntu.com feisty-security/multiverse Sources
Hit http://gb.archive.ubuntu.com feisty/restricted Sources
Hit http://gb.archive.ubuntu.com feisty/universe Packages
Hit http://gb.archive.ubuntu.com feisty/universe Sources
Hit http://gb.archive.ubuntu.com feisty/multiverse Packages
Hit http://gb.archive.ubuntu.com feisty/multiverse Sources
Hit http://gb.archive.ubuntu.com feisty-updates/main Packages
Hit http://gb.archive.ubuntu.com feisty-updates/restricted Packages
Hit http://gb.archive.ubuntu.com feisty-updates/main Sources
Hit http://gb.archive.ubuntu.com feisty-updates/restricted Sources
Get: 4 http://archive.ubuntu.com feisty-proposed Release.gpg [191B]
Ign http://archive.ubuntu.com feisty-proposed/restricted Translation-en_GB
Get: 5 http://kubuntu.org feisty Release.gpg [189B]
Ign http://kubuntu.org feisty/main Translation-en_GB
Ign http://archive.ubuntu.com feisty-proposed/main Translation-en_GB
Ign http://archive.ubuntu.com feisty-proposed/multiverse Translation-en_GB
Ign http://archive.ubuntu.com feisty-proposed/universe Translation-en_GB
Get: 6 http://archive.ubuntu.com feisty-backports Release.gpg [191B]
Ign http://archive.ubuntu.com feisty-backports/restricted Translation-en_GB
Ign http://archive.ubuntu.com feisty-backports/main Translation-en_GB
Hit http://kubuntu.org feisty Release
Err http://kubuntu.org feisty Release

Ign http://archive.ubuntu.com feisty-backports/multiverse Translation-en_GB
Ign http://archive.ubuntu.com feisty-backports/universe Translation-en_GB
Hit http://archive.ubuntu.com feisty-proposed Release
Hit http://archive.ubuntu.com feisty-backports Release
Get: 7 http://kubuntu.org feisty Release [2889B]
Ign http://kubuntu.org feisty Release
Hit http://archive.ubuntu.com feisty-proposed/restricted Packages
Hit http://archive.ubuntu.com feisty-proposed/main Packages
Hit http://archive.ubuntu.com feisty-proposed/multiverse Packages
Hit http://archive.ubuntu.com feisty-proposed/universe Packages
Hit http://kubuntu.org feisty/main Packages
Hit http://archive.ubuntu.com feisty-backports/restricted Packages
Hit http://archive.ubuntu.com feisty-backports/main Packages
Hit http://archive.ubuntu.com feisty-backports/multiverse Packages
Hit http://archive.ubuntu.com feisty-backports/universe Packages
Get: 8 http://medibuntu.sos-sts.com feisty Release.gpg [189B]
Ign http://medibuntu.sos-sts.com feisty/free Translation-en_GB
Ign http://medibuntu.sos-sts.com feisty/non-free Translation-en_GB
Hit http://medibuntu.sos-sts.com feisty Release
Hit http://medibuntu.sos-sts.com feisty/free Packages
Hit http://medibuntu.sos-sts.com feisty/non-free Packages
Hit http://medibuntu.sos-sts.com feisty/free Sources
Hit http://medibuntu.sos-sts.com feisty/non-free Sources
Fetched 3084B in 23s (131B/s)
Reading package lists... Done
W: GPG error: http://kubuntu.org feisty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A506E6D4DD4D5088
W: You may want to run apt-get update to correct these problems
root@tim-little-laptop:/var/lib/apt/lists#

[Invalid User (invalid)]

It's not necessarily the biggest concern on your plate but it would be a good idea to get that key to suppress further errors from packages/upgrades from that server.

[Tim Smith (auxiliary.chipmunk)]

isn't this the main Kubuntu repository though?

where do i get the GPG key for "http://kubuntu.org feisty Release"

[ChrisKelley (ckelley)]

from: http://<email address hidden>/2007-07-05.html

gpg --keyserver subkeys.pgp.net --recv 58403026387EE263 && gpg --export --armor 58403026387EE263 | sudo apt-key add -

gpg --keyserver subkeys.pgp.net --recv A506E6D4DD4D5088 && gpg --export --armor A506E6D4DD4D5088 | sudo apt-key add -

worked for me. i got here via googling for the error. typing the above fixed it. :D