1. Install VMBox Guest Additions (menu Devices -> Insert Guest Additions CD Image, then sudo run .run file from mounted media)

  2. Install guest tools on guest machine:

sudo apt install virtualbox-guest-utils
  1. Add user to group on guest machine:
sudo adduser $USER vboxsf
  1. Now we can add shared folders via main menu: Devices -> Shared Folders -> Shared Folders Settings...
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