not ln /usr/bin/java

paul@ubuntu:/usr/lib/jvm/java-6-openjdk/bin$ LANG=en java -version
The program 'java' can be found in the following packages:
 * gcj-4.4-jre-headless
 * gcj-4.6-jre-headless
 * openjdk-6-jre-headless
 * gcj-4.5-jre-headless
 * openjdk-7-jre-headless
Try: sudo apt-get install <selected package>

NEED!
sudo ln -s /usr/lib/jvm/java-6-openjdk/bin/java /usr/bin/java

paul@ubuntu:/usr/lib/jvm/java-6-openjdk/bin$ LANG=en java -version
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b24~pre1-1ubuntu3)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: openjdk-6-jre 6b24~pre1-1ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-3.9-generic 3.2.0-rc4
Uname: Linux 3.2.0-3-generic x86_64
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
Date: Sun Dec 11 16:16:42 2011
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
 PATH=(custom, no user)
 LANG=ru_UA.UTF-8
 SHELL=/bin/bash
SourcePackage: openjdk-6
UpgradeStatus: No upgrade log present (probably fresh install)