安装JDK
1)需要从网上下载,修改一下apt的源
#cp sources.list sources.list.cdrom,备份一下
#vi sources.list,用下面的内容替换
deb http://cn.archive.ubuntu.com/ubuntu/ lucid main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ lucid-security main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ lucid-updates main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ lucid main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-security main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-updates main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse
#apt-get update,重新更新一下包列表
2)安装OpenJDK,在lucid上已经找不到sun jdk的安装包了。
#apt-get install default-jdk,提示需要下载60多M,回车确认,开始下载并安装。
#java -version,可以看到是1.6版本的Java