[TYPO3-linux] Really dummy db issue with introPKG-6.1.7 and Ubuntu 13.10 x64

[elim qiu]

I don't know if Typo3 can be successfully installed to Ubuntu 13.10， but I do encounter a very strange difficult running the installation tool:

No matter how hard I tried, it kept telling me database connection failure: 

Connecting to SQL database failed with these settings: 
Username: elim 
Host: localhost

But I can run phpmyadmin with the same user and password, and 
mysql shell worked just fine:

elim at uLnx:~/Downloads/php_CMS$ mysql -uelim -preason2
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 79
Server version: 5.5.35-0ubuntu0.13.10.2 (Ubuntu)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
------------------------------

The system is Ubuntu 13.10 64 bit
MySQL version 5.5.35 (Too new?)
How typo3 connect to MySQL? How can I debug and find out what's exactly wrong? 

Thanks a lot for any help. (I just installed mybb with no problems, that gave me some hope on typo3)