sudo gedit /etc/hosts
#以下を追記
127.0.0.1 phpmyadmin.localhost

sudo gedit /etc/nginx/sites-available/default

server {
	client_max_body_size 100M;
	listen 80;
	server_name phpmyadmin.localhost;
	root /usr/share/phpmyadmin;
	index index.html index.htm index.php;
	location / {
		try_files $uri $uri/ =404;
	}
	location ~ \.php$ {
		fastcgi_split_path_info ^(.+\.php)(/.+)$;
	#	# NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
	#
	#	# With php5-cgi alone:
	#	fastcgi_pass 127.0.0.1:9000;
	#	# With php5-fpm:
		fastcgi_pass unix:/var/run/php5-fpm.sock;
		fastcgi_index index.php;
		include fastcgi_params;
	}
}