W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4F191A5A8844C542

[kenorb]

The following error appears when I'm running apt-get update:

$ sudo apt-get update
Hit http://ch.archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://ch.archive.ubuntu.com precise-updates/restricted Translation-en
Hit http://ch.archive.ubuntu.com precise-updates/universe Translation-en

Reading package lists... Done
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4F191A5A8844C542

[kenorb (kenorb)]

Related:
http://askubuntu.com/questions/169349/how-to-fix-couldnt-connect-to-host-error-installing-unity-webapps
http://ubuntuforums.org/showthread.php?t=2017375
http://ubuntuforums.org/showthread.php?t=2032493

Possible solution:
http://askubuntu.com/questions/1877/what-is-the-easiest-way-to-resolve-apt-get-badsig-gpg-errors

Workaround command:
sudo apt-key adv --recv-keys --keyserver ppa.launchpad.net 4F191A5A8844C542

Any other solution?

[kenorb (kenorb)]

Also see:
https://answers.launchpad.net/ubuntu/+source/apt/+question/202373

[kenorb (kenorb)]

$ ll /etc/apt/sources.list.d
-rw-r--r-- 1 root root 134 Jul 24 11:27 xorg-edgers-ppa-precise.list
-rw-r--r-- 1 root root 134 Jul 24 11:27 xorg-edgers-ppa-precise.list.save

[kenorb (kenorb)]

I could upload the file: /etc/apt/sources.list
But I can't , because of another KDialog bug, which is for me the blocker of this:
https://bugs.launchpad.net/ubuntu/+source/kde-baseapps/+bug/1053869

[kenorb (kenorb)]

Any solution to have this key accepted by default?

[kenorb (kenorb)]

$ sudo apt-key adv --recv-keys --keyserver ppa.launchpad.net 4F191A5A8844C542
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.bP2OeBc8rz --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --recv-keys --keyserver ppa.launchpad.net 4F191A5A8844C542
gpg: requesting key 8844C542 from hkp server ppa.launchpad.net
gpgkeys: key 4F191A5A8844C542 not found on keyserver
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

[Pedro Sardinha (sardinha-web)]

Hi!

I solved using Y PPA (https://launchpad.net/y-ppa-manager).

Regards!

[Martin Pitt (pitti)]

Apparently you didn't use add-apt-repository (which fetches the PPA key automatically), but just added the apt source manually without adding the key?