Installing Eclipse 3.7 on Ubuntu 11.4 Problem

[YasinG]

I have been trying to install Eclipse 3.7 on Ubuntu 11.4 but I ran into a problem. I followed this article (http://colinrrobinson.com/technology/install-eclipse-ubuntu/), downloading eclipse-SDK-3.7.2-linux-gtk.tar.gz, and all was well, seemingly, until the very last step:

6) Launch Eclipse for the first time

sudo /opt/eclipse/eclipse -clean &

Which gives me this reply:
[1] 6719
User@User:~$ sudo: /opt/eclipse/eclipse: command not found

Also, when I try to run it from gnome and click the icon it starts to run but then disappears, or quits, immediately.
I'd appreciate it if anyone could help me.
Thanks in advance.

[YasinG]

The problem is, somehow solved, after I have used this command on the same tar file but from desktop this time:

tar xvfz eclipse-SDK-3.7.2-linux-gtk.tar.gz -C /opt

The one I used at first, following the article I linked in the first comment, was slightly different, although I have no idea what's the difference:

tar xzf eclipse-SDK-3.7-linux-gtk-x86_64.tar.gz

Have a nice day.