vagarnt sshすると下記のエラーでが出ます。

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

Qiitaに記載されてた下記の対処法でも解決されませんが、
別途解決法をご存知の方がいらっしゃれば教えてください。
http://qiita.com/murachi1208/items/1dea1416ec5729d03632

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