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[m2e-users] Eclipse and workspace copied from old XP to new Win7 fails to update with "There were no installable units selected when the plan was computed." 
I had Eclipse installed on my old XP laptop. I was getting a new Win7 laptop, and I copied the eclipse tree and my workspace to the new laptop. Most everything appears to work on the new laptop, but problems started when I saw a plugin update come through (for "Maven Integration for WTP"). I tried updating on both the old and new laptops. The update on the old laptop went through fine, but the update attempt on the new laptop fails with "There were no installable units selected when the plan was computed."

This is the log file excerpt corresponding to the attempt:
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    !ENTRY org.eclipse.equinox.p2.operations 4 0 2012-02-03 16:34:51.791 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2012-02-03 16:34:51.791 !MESSAGE Cannot complete the install because one or more required items could not be found. !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-02-03 16:34:51.791 !MESSAGE Software currently installed: Shared profile 1.0.0.1328029049876 (SharedProfile_com.springsource.sts.ide 1.0.0.1328029049876) !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-02-03 16:34:51.791 !MESSAGE Missing requirement: Shared profile 1.0.0.1328029049876 (SharedProfile_com.springsource.sts.ide 1.0.0.1328029049876) requires 'org.maven.ide.eclipse [1.1.0.20120130-2016]' but it could not be found

    !ENTRY org.eclipse.equinox.p2.operations 4 0 2012-02-03 16:34:52.325 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2012-02-03 16:34:52.325 !MESSAGE Cannot complete the install because one or more required items could not be found. !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-02-03 16:34:52.325 !MESSAGE Software currently installed: Shared profile 1.0.0.1328029049876 (SharedProfile_com.springsource.sts.ide 1.0.0.1328029049876) !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-02-03 16:34:52.325 !MESSAGE Missing requirement: Shared profile 1.0.0.1328029049876 (SharedProfile_com.springsource.sts.ide 1.0.0.1328029049876) requires 'org.maven.ide.eclipse [1.1.0.20120130-2016]' but it could not be found

    !ENTRY org.eclipse.equinox.p2.operations 4 0 2012-02-03 16:34:52.362 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2012-02-03 16:34:52.362 !MESSAGE Cannot complete the install because one or more required items could not be found. !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-02-03 16:34:52.362 !MESSAGE Software currently installed: Shared profile 1.0.0.1328029049876 (SharedProfile_com.springsource.sts.ide 1.0.0.1328029049876) !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-02-03 16:34:52.362 !MESSAGE Missing requirement: Shared profile 1.0.0.1328029049876 (SharedProfile_com.springsource.sts.ide 1.0.0.1328029049876) requires 'org.maven.ide.eclipse [1.1.0.20120130-2016]' but it could not be found

    !ENTRY org.eclipse.equinox.p2.ui 4 0 2012-02-03 16:34:52.438 !MESSAGE There were no installable units selected when the plan was computed.

    !ENTRY org.eclipse.equinox.p2.ui 4 0 2012-02-03 16:34:52.440 !MESSAGE There were no installable units selected when the plan was computed.

    !ENTRY org.eclipse.equinox.p2.ui 4 0 2012-02-03 16:34:52.440 !MESSAGE There were no installable units selected when the plan was computed.
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I always start Eclipse with "-clean".  I've tried "Update Project" for the Maven projects.  Neither of these made a difference.

I don't know what to do to diagnose this.

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