Seems to be a recurrent issue - not being able to download the well-known keys.

gpg --search-keys torvalds@kernel.org and gpg --search-keys gregkh@linuxfoundation.org usually allow to manually find and import these keys.

The problems you have are due to miscommunication with the keyserver - either a network issue, or a temporary disconnection of the server or the key server itself that will strip the user id (see this forum article).

It would be a good idea to list several GPG servers in your gpg.conf file.

keyserver hkps://keys.openpgp.org
keyserver hkp://keys.gnupg.net
keyserver hkps://pgp.mit.edu
keyserver hkps://keyserver.ubuntu.com:80

gpg: error reading key: No public key pub rsa4096 2011-09-23 [SC] 647F28654894E3BD457199BE38DBBDC86092693E uid [ unknown] Greg Kroah-Hartman gregkh@linuxfoundation.org uid [ unknown] Greg Kroah-Hartman gregkh@kernel.org uid [ unknown] Greg Kroah-Hartman (Linux kernel stable release signing key) greg@kroah.com sub rsa4096 2011-09-23 [E]

:: PGP keys need importing: -> ABAF11C65A2970B130ABE3C479BE3E4300411886, required by: linux-xanmod-lts-linux-bin-x64v2 :: Import? [Y/n] y :: Importing keys with gpg... gpg: keyserver receive failed: No data -> problem importing keys

⚠ INFO: We had to switch to SourceForge for retrieving the binaries.

Unfortunately, the bandwidth will not always be satisfactory - so the download time could be 20x longer. Plan your updates accordingly.