我不想OpenJDK在我的 Ubuntu 13.04 系统上安装，但尝试卸载会openjdk-7-jre产生以下消息：
$ sudo apt-get purge openjdk-7-jre
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
gcj-4.7-base gcj-4.7-jre gcj-4.7-jre-headless gcj-4.7-jre-lib gcj-jre gcj-jre-headless icedtea-6-jre-cacao icedtea-6-jre-jamvm libgcj-common libgcj13 libgcj13-awt
openjdk-6-jre-headless openjdk-6-jre-lib
Suggested packages:
fastjar gcj-4.7-jdk gcj-jdk libgcj13-dbg sun-java6-fonts fonts-ipafont-gothic fonts-ipafont-mincho ttf-telugu-fonts ttf-oriya-fonts ttf-kannada-fonts
ttf-bengali-fonts
The following packages will be REMOVED:
default-jre* icedtea-7-plugin* icedtea-netx* icedtea-plugin* libatk-wrapper-java* libatk-wrapper-java-jni* openjdk-7-jre*
The following NEW packages will be installed:
gcj-4.7-base gcj-4.7-jre gcj-4.7-jre-headless …