I'm on 12.04 LTS, and trying to use Eclipse Indigo.

This morning Ubuntu made me update the following packages:

Preparing to replace icedtea-6-jre-cacao 6b24-1.11.3-1ubuntu0.12.04.1 (using .../icedtea-6-jre-cacao_6b24-1.11.4-1ubuntu0.12.04.1_amd64.deb) ...
Unpacking replacement icedtea-6-jre-cacao ...
Preparing to replace openjdk-6-jre-lib 6b24-1.11.3-1ubuntu0.12.04.1 (using .../openjdk-6-jre-lib_6b24-1.11.4-1ubuntu0.12.04.1_all.deb) ...
Unpacking replacement openjdk-6-jre-lib ...
Preparing to replace icedtea-6-jre-jamvm 6b24-1.11.3-1ubuntu0.12.04.1 (using .../icedtea-6-jre-jamvm_6b24-1.11.4-1ubuntu0.12.04.1_amd64.deb) ...
Unpacking replacement icedtea-6-jre-jamvm ...
Preparing to replace openjdk-6-jre-headless 6b24-1.11.3-1ubuntu0.12.04.1 (using .../openjdk-6-jre-headless_6b24-1.11.4-1ubuntu0.12.04.1_amd64.deb) ...
Unpacking replacement openjdk-6-jre-headless ...
Preparing to replace openjdk-6-jre 6b24-1.11.3-1ubuntu0.12.04.1 (using .../openjdk-6-jre_6b24-1.11.4-1ubuntu0.12.04.1_amd64.deb) ...
Unpacking replacement openjdk-6-jre ...

After that (but I cannot swear it is the root cause), I have the following issues in Eclipse:

• When trying to launch the simplest HelloWorld program (which behaves fine with manual javac/java), I get either nothing or:

  An internal error occurred during: "Launching HelloWorld".
  org/eclipse/jdt/debug/core/JDIDebugModel

• I get an "Error log" tab in the console panel, with an error:

  Could not create the view: An unexpected exception was thrown.

  (Follows a consequent NullPointerException stacktrace between sun.util.calendar.ZoneInfoFile.getZoneIDs(ZoneInfoFile.java:785) and org.eclipse.equinox.launcher.Main.main(Main.java:1386))

• When trying to access the Installed JREs part of the preferences, I get a popup saying:

  Unable to create the selected preference page.
  An error occurred while automatically activating bundle org.eclipse.jdt.debug.ui (162).

  And the preference tab says An error has occurred when creating this preference page.

Until today I had a manually installed Eclipse (one of the official bundles available on their site), I've tried to replace it by the repository version and I get the same errors.

What should I do to make Eclipse work again?

Another person reports: Same happened to me after updating last night. Already tried reinstalling Eclipse and Java, starting Eclipse with -clean and starting new workspace and new .eclipse dir, but nothing helps.