我做并得到
# http://stackoverflow.com/a/10260634/54964
root@masi:/home/masi/Documents# gpg --keyserver subkeys.pgp.net --recv-key 06F90DE5381BA480
gpg: directory `/root/.gnupg' created
gpg: new configuration file `/root/.gnupg/gpg.conf' created
gpg: WARNING: options in `/root/.gnupg/gpg.conf' are not yet active during this run
gpg: keyring `/root/.gnupg/secring.gpg' created
gpg: keyring `/root/.gnupg/pubring.gpg' created
gpg: requesting key 381BA480 from hkp server subkeys.pgp.net
?: subkeys.pgp.net: Network is unreachable
gpgkeys: HTTP fetch error 7: couldn't connect: Network is unreachable
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
我正在尝试更改为 R 向后移植，因为我需要 R 3.3.2，所以我已经在/etc/apt/sources.list
deb http://cran.wu.ac.at/bin/linux/debian jessie-cran3/
迭代 rcs 的提案
root@masi:/home/masi/Documents# gpg --keyserver keys.gnupg.net --recv-key 06F90DE5381BA480
gpg: requesting key 381BA480 from hkp server keys.gnupg.net
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key 381BA480: public key "Johannes Ranke (CRAN Debian archive) <[email protected]>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1
root@masi:/home/masi/Documents# apt-get update
...
Fetched 116 kB in 3s (32.1 kB/s)
Reading package lists... Done
W: GPG error: http://cran.wu.ac.at jessie-cran3/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 06F90DE5381BA480
操作系统：Debian 8.5