After update to Ubuntu in VirtualBox, shared folder no longer mounting!

I recently applied a bunch of updates to my guest OS (Ubuntu) inside VirtualBox (NOTE: NOT updates to virtual box. Updates to the OS) and now on startup, I get the error:

"An error occurred while mounting /media/share. Press S to skip mounting or M for manual recovery"

I tried a fix which said to comment out the mounting in /etc/fstab and instead put it into rc.local, but this does not work.

Also, when I press “M” to try it manually and type:

mount.vboxsf -w mysharedfolder /media/share

I get the error:

mount.vboxsf: mounting failed with the error: No such device

But before I updated Ubuntu, that shared folder worked perfectly!

Any idea how to fix this?

This is SOLVED!

All I had to do was reinstall Guest Additions and now it works!