This post is older than a year. Consider some information might not be accurate anymore.
I just setup my new Linux development environment. Try to import my GnuPG keys, and failed due the keyserver didn’t exist anymore. This post demonstrates how to change the keyserver and fetch your public key from it.
First of all open the smart card for edit.
tan@pavilion:~$ gpg --card-edit Application ID ...: D2760001240102000005000013380000 Version ..........: 2.0 Manufacturer .....: ZeitControl Serial number ....: 00001338 Name of cardholder: Tan-Vinh Nguyen Language prefs ...: de Sex ..............: male URL of public key : x-hkp://keys.gnupg.net Login data .......: [not set] Signature PIN ....: forced Key attributes ...: 2048R 1024R 2048R Max. PIN lengths .: 32 32 32 PIN retry counter : 3 3 3 Signature counter : 12 Signature key ....: 194E 8306 8A0B E98E F652 A26E 4ABB 594B 5E39 6988 created ....: 2012-03-30 21:36:12 Encryption key....: 2C12 F108 5410 0F9E F8C1 091E 8E72 9373 E29C F3C9 created ....: 2012-03-30 21:36:55 Authentication key: 1CD7 2E69 425C 29A0 C963 EEEF E337 6331 F981 E710 created ....: 2012-03-30 21:36:55 General key info..: [none]
Using the command prompt with fetch (key), complains no valid OpenPGP data was found.
gpg/card> fetch gpg: requesting key 5E396988 from hkp server keys.gnupg.net gpgkeys: key 194E83068A0BE98EF652A26E4ABB594B5E396988 can't be retrieved gpg: no valid OpenPGP data found. gpg: Total number processed: 0
Now we are going to change the key server. Therefore we need to enable the admin commands and change the keyserver. We need to confirm the change with the admin code (usually 8 digits long).
gpg/card> url URL to retrieve public key: x-hkp://pgp.mit.edu
Now we can fetch it and we can leave the gpg command prompt.
gpg/card> fetch gpg: requesting key 5E396988 from hkp server pgp.mit.edu gpg: key 5E396988: public key "xxx" imported gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1) gpg/card> quit