出现了什么No WPMU site defined on this host.
网上查了一下，把wp-config.php删掉再装一遍

Installation Finished!
Congratulations! Your WordPress µ site has been configured.

You can log in using the username "admin" and password a22931f2cc11

Directory Permissions
Please remember to reset the permissions on the following directories:

/var/www/wordpress-mu-1.3.3
/var/www/wordpress-mu-1.3.3/wp-content/

You can probably use the following command to fix the permissions but check with your host if it doubt:
chmod 755 /var/www/wordpress-mu-1.3.3 /var/www/wordpress-mu-1.3.3/wp-content/

Further reading

If you run into problems, please search the WordPress µ Forums where you will most likely find a solution. Please don't post there before searching. It's not polite.
There is also the WordPress µ Trac. That's our bug tracker.

Thanks for installing WordPress µ!

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wpmu version: 2.3.3