ubuntu phpmyadmin 404 not found

装phpayadmin出错了。

phpmyadmin 404 not found 

buntu 安装phpmyadmin后无法在http://ip地址/phpmyadmin下访问，
原因是ubuntu下phpmyadmin默认安装在/usr /share/phpmyadmin,而不是/var/www下，
所以只需在终端输入
sudo ln -s /usr/share/phpmyadmin/ /var/www/

然后变成了

phpMyAdmin - Error

The json extension is missing. Please check your PHP configuration.

The fix was simple: run "sudo apt-get install php5-json".

Then I restarted apache: "sudo service apache2 restart"