Dotdeb signatures couldn't be verified

Понадобилось поставить PHP 5.6 на Debian Wheezy, добавил репу DotDeb https://www.dotdeb.org/instructions/
При apt-get update вылезло:
W: GPG error: http://packages.dotdeb.org wheezy-php56-zts Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9C74FEEA2098A6E

Решается просто:

# gpg --keyserver keys.gnupg.net --recv-key 89DF5277

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 89DF5277 from hkp server keys.gnupg.net

gpg: /root/.gnupg/trustdb.gpg: trustdb created

gpg: key 89DF5277: public key "Guillaume Plessis <gui@dotdeb.org>" imported

gpg: no ultimately trusted keys found

gpg: Total number processed: 1

gpg:               imported: 1  (RSA: 1)

# gpg -a --export 89DF5277 | apt-key add -

OK