My virtualbox fstab will not auto-mount on reboot?
Try removing the "defaults 0 0" part. Just a hunch.
Found this (put this instead of the defaults):rw,uid=1000,gid=1000
Report back. :)
Running debian jessie as host, i used the option comment=systemd.automount in my /etc/fstab to get it working (in addition to the suggestion of Azizur):
Share /var/sfshare vboxsf auto,rw,uid=33,gid=33,umask=0007,comment=systemd.automount 0 0
uid, gid and umask were set for compatibility with owncloud (v7.0.4) to use the mount point as data folder.
https://ask.fedoraproject.org/en/question/48578/fstab-mount-with-virtualbox-shared-folders/