Problem while installing ADT on eclipse galileo (ubuntu)

I have eclipse Galileo installed my ubuntu machine. It was working fine with Android 2.2 ADT. But in between something happened and I was not able to run any program. So I uninstalled Eclipse and reinstalled. Now When I try to installed ADT, it is giving errors.

Help -> Install new packages -> Work With (add) Name :ADT.

Location:http://dl-ssl.google.com/android/eclipse/

It is listing ->Developing tool. I selected it and pressed 'Next' It is giving following error.

The operation cannot be completed.  See the details.
Cannot complete the install because one or more required items could not be found.
  Software being installed: Android De开发者_如何学JAVAvelopment Tools 11.0.0.v201105251008-128486 (com.android.ide.eclipse.adt.feature.group 11.0.0.v201105251008-128486)
  Missing requirement: Android Development Tools 11.0.0.v201105251008-128486 (com.android.ide.eclipse.adt.feature.group 11.0.0.v201105251008-128486) requires 'org.eclipse.wst.xml.core 0.0.0' but it could not be found.

Please help me to install ADT on eclipse.

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Try it and if it works:

http://android-er.blogspot.com/2009/11/cannot-complete-install-because-one-or.html

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Go to **window>>Preferences>>android and proper sdk location is given or not.. and then click apply..

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1. Start Eclipse, then select Help > Install New Software....
2. Click Add, in the top-right corner.
3. In the Add Site dialog, click Archive.
4. Browse and select the downloaded zip file.
5. Enter a name for the local update site (e.g., "Android Plugin") in the "Name" field.
6. Click OK.

If it will not work then give ADT plugin location directly from internet.