virtualbox.org

Host is Windows 10, guest is Oracle Linux 7.
VirtualBox version is 5.04.
I installed guest additions, and the mounting worked fine at first with:
"mount -t vboxsf db_install .", where db_install is a shared folder configured in the VM.
From a certain point in time (don't know what I did exactly to cause this), this just stopped working, and with every shared folder I try to mount it throws:

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

Suggestions?

Sounds like a Linux Guest question to me, not a problem with the Windows host.

This kind of thing usually happens after a kernel update if you do not have dkms installed. Recompile or install the guest additions again and see if that helps.

Moving to Linux Guest