It seems this occur on OpenVZ ubuntu 12.04/14.04 minimal template.
root@xxxxx:~# ee stack install webAdding rtCamp NGINX launchpad repository, please wait...
Adding Ondrej PHP5 launchpad repository, please wait...
Adding Percona repository, please wait...
gpg: [stdout]: write error: Broken pipe
gpg: iobuf_flush failed on close: file write error
[ Sun Oct 26 02:37:11 EDT 2014 ] Unable to add Percona GnuPG key, exit status = 127
root@xxxxx:~#
Manually adding the Percona GPG key did not fix the issue
apt-key adv --keyserver keys.gnupg.net --recv-keys 1C4CBDCDCD2EFD2A
However I can install percona mysql 5.6 manually.
apt-get install percona-server-server-5.6 percona-server-client-5.6
OS info:
root@xxxxx:~# uname -a
Linux xxxxx 2.6.32-042stab093.4 #1 SMP Mon Aug 11 18:47:39 MSK 2014 x86_64 x86_64 x86_64 GNU/Linux
root@xxxxx:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
Update: Install without a hitch on Ubuntu 12.04/14.04 OpenVZ default template.
Maybe there’s some package missing in OpenVZ Ubuntu 12.04/14.04 minimal template?