用nvm 安装nodeV0.12.0版本时报权限不足

nvm install v0.12.0 安装时报权限不足，

mkdir: cannot create directory ‘/home/ubuntu/.nvm/bin’: Permission denied
grep: /home/ubuntu/.nvm/bin/node-v0.12.0-linux-x64/node-v0.12.0-linux-x64.tar.gz: No such file or directory
Binary download failed, trying source.
mkdir: cannot create directory ‘/home/ubuntu/.nvm/src’: Permission denied
nvm: install v0.12.0 failed!

但是前面加了sudo 会直接报 sudo: nvm: command not found

sudo: nvm: command not found

你不是用root用户登录的，，权限不够