Cannot enable memcached plugin

Receive the following error message when I run: libevent2 is installed on the machine. Occurs with an upgrade from 14.04 AND with a fresh 16.04 build

mysql> install plugin daemon_memcached SONAME 'libmemcached.so';
ERROR 1126 (HY000): Can't open shared library '/usr/lib/mysql/plugin/libmemcached.so' (errno: 2 /usr/lib/mysql/plugin/libmemcached.so: undefined symbol: event_base_set)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.12-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Wed May 18 12:13:05 2016
InstallationDate: Installed on 2016-04-21 (26 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
KernLog: [262709.935987] SGI XFS with ACLs, security attributes, realtime, no debug enabled
Logs.var.log.daemon.log:

Logs.var.log.mysql.error.log:
MySQLConf.etc.mysql.mysql.conf.d.mysqld_safe_syslog.cnf:
 [mysqld_safe]
 syslog
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:
SourcePackage: mysql-5.7
UpgradeStatus: No upgrade log present (probably fresh install)