Laravel 4 无法在Ubuntu中运行homestead

Ubuntu版本：Ubuntu 14.04.1 LTS

我做了所有的事情，当我输入homestead时，它就出来了

/opt/vagrant/embedded/gems/gems/vagrant-1.6.5/lib/vagrant/environment.rb:763:in `chmod': Operation not permitted - /home/chan/.vagrant.d/insecure_private_key (Errno::EPERM)
    from /opt/vagrant/embedded/gems/gems/vagrant-1.6.5/lib/vagrant/environment.rb:763:in `chmod'
    from /opt/vagrant/embedded/gems/gems/vagrant-1.6.5/lib/vagrant/environment.rb:763:in `copy_insecure_private_key'
    from /opt/vagrant/embedded/gems/gems/vagrant-1.6.5/lib/vagrant/environment.rb:171:in `initialize'
    from /opt/vagrant/bin/../embedded/gems/gems/vagrant-1.6.5/bin/vagrant:165:in `new'
    from /opt/vagrant/bin/../embedded/gems/gems/vagrant-1.6.5/bin/vagrant:165:in `<main>'

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你没有权限更改/home/chan/.vagrant.d/unsecure\u private\u keyCan，如果我使用sudo homestead up，它会显示sudo:homestead:command not found/home/chan/.vagrant.d目录的权限是什么？所有者是我，mod是777