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Source: howtoGeek, ubuntuForum

Question: How to use Shared Folder in VirtualBox (Window 10 host, Linux Mint 17.3 guest)?

Answer:

1. Read howToGeek for general setup. In my case VBOXSRV doesn't show in Windows' Network. The second part is for VMWare. don't do that.
2. After that if it doesn't work then in Linux Mint open terminal and do:

viet@uviet-VirtualBox:~$ sudo adduser viet vboxsf
[sudo] password for urock: 
Adding user `viet' to group `vboxsf' ...
Adding user viet to group vboxsf
Done.

1. May need Log out/ Log in for this to take effect.