我有一个干净的 VPS，使用 Ubuntu 14.04 LTS x64。并尝试了以下操作：
# Upgrade The Base Packages
apt-get update
apt-get upgrade -y
# Add A Few PPAs To Stay Current
apt-get install -y software-properties-common
apt-add-repository ppa:nginx/stable -y
apt-add-repository ppa:rwky/redis -y
apt-add-repository ppa:chris-lea/node.js -y
apt-add-repository ppa:ondrej/php5-5.6 -y
但是在最后一个失败了：
root@xxx:~# apt-add-repository ppa:ondrej/php5-5.6 -y
gpg: keyring `/tmp/tmp9jdzm9kw/secring.gpg' created
gpg: keyring `/tmp/tmp9jdzm9kw/pubring.gpg' created
gpg: requesting key E5267A6C from hkp server keyserver.ubuntu.com
gpg: /tmp/tmp9jdzm9kw/trustdb.gpg: trustdb created
gpg: key E5267A6C: public key "Launchpad PPA for Ond\xc5\x99ej Sur?" imported
gpg: Total number processed: …