ubuntu 12.04lts 安装oracle 11G r2

我在ubuntu12.04 lts 安装oracle 11G r2，在安装到95%的时候，出现了这个错误：[INS-20802] Oracle Net Configuration Assistant failed.
日志信息INFO: UnsatisfiedLinkError exception loading native library: njni11INFO: java.lang.UnsatisfiedLinkError: /opt/oracle/product/11.2.0/dbhome_1/lib/libnjni11.so: libaio.so.1: cannot open shared object file: No such file or directoryINFO: Error: jniGetOracleHomeINFO: Oracle Net Services configuration failed. The exit code is 1WARNING:INFO:INFO: Completed Plugin named: Oracle Net Configuration Assistant
我尝试过网上的找的解决方案：安装这个补丁p8670579_112010_LINUX.zip。但结果还是不行。

还有一个问题，在ubuntu12.04安装JDK、ORACLE11g应该在哪设置环境变量才对？
~/.bashrc或是/etc/profile还是/etc/environment？

请各位帮忙解答一下，谢谢！