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I have a windows 7 host where I'm using a Virtualbox 5.2.8. On this Virtualbox I've installed a VM with Ubuntul Server 16.04 and the Guest Additions from this version of virtualbox and I'm trying to share a directory.

Everything is properly set from virtualbox's side, the shared directory it's also present on /media path from ubuntu but unfortunately I can't mount it to be able to see the files from that shared directory (even if it has some files, on ubuntu it's seen as empty).

To mount it, I'm running this command:

ben@ubuntu:/mnt$ sudo mount -t vboxsf angfiles shares

/sbin/mount.vboxsf: mounting failed with the error: Protocol error

I already have the /mnt/shares directory.

Can you help me please with a hint to solve this issue?

  • See askubuntu.com/a/30446/3940 - is the guest user in group vboxsf? – Takkat Mar 27 '18 at 20:45
  • I don't see to have any guest user on my ubuntu guest so I can't add it to a certain group. – Beniamin Gheorghita Apr 1 '18 at 5:55
  • This is the list with my existing users: root daemon bin sys sync games man lp mail news uucp proxy www-data backup list irc gnats nobody systemd-timesync systemd-network systemd-resolve systemd-bus-proxy syslog _apt lxd messagebus uuidd dnsmasq ben vboxadd sshd I've just added vboxadd to the vboxsf group and looks to work, thank you! – Beniamin Gheorghita Apr 1 '18 at 6:04
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The guest user was vboxadd and after adding it on vboxsf group this issue has been solved.

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