I had this problem when upgrading from ubuntu 10.04 to 10.10. Deleting the .eclipse folder in my home directory got rid of the version problems. I could then install the proper CDT from inside eclipse using the default source (http://download.eclipse.org/releases/galileo/) and everything worked like normal.
This was on a fresh install of ubuntu 10.10, keeping my old home directory, and using default software sources (installed eclipse with "sudo apt-get install eclipse").
I had this problem when upgrading from ubuntu 10.04 to 10.10. Deleting the .eclipse folder in my home directory got rid of the version problems. I could then install the proper CDT from inside eclipse using the default source (http:// download. eclipse. org/releases/ galileo/) and everything worked like normal.
This was on a fresh install of ubuntu 10.10, keeping my old home directory, and using default software sources (installed eclipse with "sudo apt-get install eclipse").