Android-org. Eclipse. WST. SSE. Core 0.0.0 'But it cocould not be found

When installing ADT on Ubuntu today, find the dependency and say org. Eclipse. WST. SSE. Core 0.0.0 'But it cocould not be found cannot be installed again.

Some people have found some solutions on the Internet. Some people say they want to reinstall eclipse...
Now I will write down my solution:
First, help-> install new software-> available software sites
Check if there is any updated version of your eclise. For example, I use indigo.
I just add a http://download.eclipse.org/releases/indigo site

Return to the install new software interface and add the ADT

HTTPS:// Dl-ssl.google.com/android/eclipse/

Click Next to search for dependencies in eclipse. It takes a long time to search for dependencies in the indigo Update site. After the search is complete, you can install eclipse.

I am ashamed to reinstall the eclipse solution for this problem ....