sl33k@sl33k-laptop:~$  sudo apt-get remove default-jre-headless openjdk-6-jre-headless
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
  ant: Depends: default-jre-headless but it is not going to be installed or
                java2-runtime-headless or
                java5-runtime-headless or
                java6-runtime-headless
  ca-certificates-java: Depends: openjdk-6-jre-headless (>= 6b16-1.6.1-2) but it is not going to be installed or
                                 java6-runtime-headless
  default-jre: Depends: default-jre-headless (= 1:1.6-43ubuntu2) but it is not going to be installed
  icedtea-6-jre-cacao: Depends: openjdk-6-jre-headless (= 6b24-1.11.3-1ubuntu0.10.04.1) but it is not going to be installed
  jetty: Depends: default-jre-headless but it is not going to be installed or
                  java5-runtime-headless
  junit4: Depends: default-jre-headless but it is not going to be installed or
                   java5-runtime-headless
  libcobertura-java: Depends: default-jre-headless but it is not going to be installed or
                              java2-runtime-headless
  libcommons-dbcp-java: Depends: default-jre-headless but it is not going to be installed or
                                 java2-runtime-headless
  libcommons-logging-java: Depends: default-jre-headless but it is not going to be installed or
                                    java1-runtime-headless or
                                    java2-runtime-headless
  libcommons-net-java: Depends: default-jre-headless but it is not going to be installed or
                                java1-runtime-headless or
                                java2-runtime-headless
  libini4j-java: Depends: default-jre-headless but it is not going to be installed or
                          java2-runtime-headless
  libjna-java: Depends: default-jre-headless but it is not going to be installed or
                        java2-runtime-headless
  libnb-svnclientadapter-java: Depends: default-jre-headless but it is not going to be installed or
                                        java2-runtime-headless
  libservlet2.3-java: Depends: default-jre-headless but it is not going to be installed or
                               java1-runtime-headless or
                               java2-runtime-headless
  libsvn-java: Depends: default-jre-headless but it is not going to be installed or
                        java5-runtime-headless
  libxerces2-java: Depends: default-jre-headless but it is not going to be installed or
                            java1-runtime-headless or
                            java2-runtime-headless
  openjdk-6-jre: Depends: openjdk-6-jre-headless (>= 6b24-1.11.3-1ubuntu0.10.04.1) but it is not going to be installed
  openjdk-6-jre-lib: Depends: openjdk-6-jre-headless (>= 6b17) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
sl33k@sl33k-laptop:~$