Install phpmyadmin
 

I has uinstalled phpmyadmin.
And now i want to install, there is an error:

http://paste.ubuntu.com/6783402/

Don't, phpmyadmin is the first part of any website to get hacked. Learn MySQL.

So why it exist?

You should download the source web of phpmyadmin and configure Apache virtual host with DocumentRoot pointing to it. Or you just: http://IP_Address/PhpMyAdmin --> Please take a look on capitalized and non-capitalized characters. It must be the same with phpmyadmin folder name. This is quickest and easiest way

It's just a first part to get hacked. But if you need to get it hacked, you must do a lot of things :)

You can do what you like I'm just giving you advice as a professional. A simple search in the National Vulnerability Database is proof enough. Most script kiddie toolkits come with exploits to software like phpmyadmin, webmin, etc. If you still insist on using it then I highly recommend you learning how to secure it. Here's a few tips from a website. Personally, I wouldn't run it and simply use MySQL directly from the CLI with a firewall enabled on the serving ports.

Just because it exists does not mean it is the best tool to use.