Vagrantでエラーが出て起動できない。
Failed to mount folders in Linux guest. This is usually because the "vboxsf" file system is not available. Please verify that the guest additions are properly installed in the guest and can work properly. The command attempted was: mount -t vboxsf -o uid=`id -u vagrant`,gid=`getent group vagrant | cut -d: -f3` vagrant /vagrant mount -t vboxsf -o uid=`id -u vagrant`,gid=`id -g vagrant` vagrant /vagrant The error output from the last command was: /sbin/mount.vboxsf: mounting failed with the error: No such device
こんなエラーが出るので
vagrant plugin install vagrant-vbguest vagrant reload
このように入力して対応したらうまくいきましたとさ。