Connecting to Oracle DB on Ubuntu 8.04 using SQL Developer

Hi,
I managed to install Oracle 11g on Ubuntu 8.04 using this guide:
http://www.pythian.com/blogs/968/installing-oracle-11g-on-ubuntu-804-lts-hardy-heron
But I don't remember the Username or SID, that's why I keep on getting ORA-12505 from SQL DEVELOPER
How can I get those missing informations?

But I don't remember the Username or SIDAssuming your DB is up and running, you can find out the SID by :
$ ps -ef | grep smon | grep -v grep
oracle   15298     1  1 10:59 ?        00:00:00 ora_smon_db11
$ here db11 is the SID.
About username, you can create one. Use Sql*Plus and OS authentication :
$ export ORACLE_SID=<your SID>
$ sqlplus / as sysdba
SQL> CREATE USER

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