When I got my Eclipse from the Ubuntu Software Center, it was good and worked fine. I could work on Java projects fine.

This week I was required to add ADT and tried the ADT-bundle, assuming it had everthing I needed, seeing that the SDK had more steps. So now, I can create Android apps using the ADT-bundle.

I tried to work on my java projects again and I now discovered:

1. I can't run my java projects: "The selection cannot be launched. And there are no recent launches." error. I also believe Eclipse doesn't know it's a java program because it all in black and white. Not the usual green/blue/red/black things when making comments, variables and Strings.
2. I can't make new projects of ANYTHING unless I use the adt-bundle. New project only offers CVS (whatever that is)
3. My perspectives seem limited. I remembered more choices and now I'm limited to [Java], Resource, CVS Repository, debug, Team Sync. I was told to be able to use perspectives to swap between Android and Java developing. Even after the ADT installation using "Install new Software",nothing.
4. I can't uninstall/purge/remove Eclipse via the terminal. I tried removing it then reinstalling it via the Ubuntu Software Cetner. No results other than it's temporary removal.
5. (Possibly unrelated) A large number of repositories are not found when updating Eclipse. (See Step 8 in Summary of what I did...)

Although, on checking the versions and installation history, I confirmed Android and Java are installed. It probably just doesn't know it's there.

Eclipse Indigo: Version: 3.7.2 Build id: I20110613-1736

Summary of what I did before and during the problem:

1. Downloaded adt-bundle. Attempted instructions from teacher. (Install new Software) (Failed but other than an annoying "can't find repository" during each update, no damage to report) (Fixed)
2. Ran "eclipse" executable from the adt-bundle.
3. Updated Eclipse. (After restart, I noticed the problem)
4. NOTE: other than window arrangement, I had no customizations. Played around with the Windows>preferences and Project>propertied. Restored to default settings after no results.
5. Tried "apt-get purge eclipse". Couldn't find Eclipse so, nothing happened. Used Software center. No results.
6. Tried swapping workspaces. I tried different folder, deeper folder, renaming. All return the same problem.
7. Deleted adt-bundle (browsed folders then delete). Got Adt-sdk only. Installed. Can't find any changes other than some disk space usage. Of course, I can't make Android apps until I unzip the bundle again.
8. Windows>Preferences>Install/Update>Available Software Sites, Checked as many repositories as possible, then updated. Still nothing.

I'm about to get a second try on uninstalling it, because I think my last action will just be taking up space. But I'll wait for tomorrow, in case the answer will help. Any thoughts?