1.error: permission denied
原因：文件权限不够
解决方法: 修改文件权限
为了获得执行权限，借助chmod指令修改文件权限即可。（r w x ）->(4 2 1)
例如：
$ chmod 777 test.sh
2.Warning: nss-myhostname is not installed
Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!.
原因：
This is all very bleeding edge so who knows what the ramifications are. I believe if you configure your networking manually via the standard files (/etc/hosts and /etc/network/interfaces) the above error message will disappear. （网络问题）
解决办法：
sudo apt-get install libnss-myhostname