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I've been using VirtualBox, currently at VirtualBox Graphical User Interface Version 6.1.16_Ubuntu r140961, for a while with several iterations of Ubuntu, currently using 20.04 as the host and two guests, one Ubuntu 20.04 and another 21.04. I've set up file sharing with each by selecting "Devices|Shared Folders|Shared Folder Settings" and then creating a Machine Folder using the dialog "Add Share" to set the shared folder on the host and then checking the Auto-mount and Make Permanent boxes. In the Ubuntu VMs I then see the folder in the Places sidebar of Nautilus with its name sf_. However when I tried this in a new VM containing Lubuntu 21.04 I don't get the shared folder in PCManFM-Qt's Places sidebar, nor is there a folder created in /media as happens in the Ubuntu VMs. I have the correct Guest Additions installed.

What other steps are necessary to make folder sharing work in the Lubuntu VM?

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  • Did you do this-->askubuntu.com/a/890740/243321
    – Organic Marble
    Jun 29, 2021 at 23:57
  • As implied by my setting up a shared folder using the VirtualBox's menu, it's just between the Ubuntu host and the Lubuntu guest. I have already created the vboxsf group, added myself to it and followed up with a reboot. I also checked that these steps are not needed in a Ubuntu host to Ubuntu guest setup.
    – Richard Quint
    Jun 30, 2021 at 0:36
  • Please add additional information to your Question, not in comments. Comments are intended to help you clarify and improve your question until it is answerable.
    – user535733
    Jun 30, 2021 at 4:01

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Found the solution. Unlike Ubuntu, just installing the Guest Additions isn't enough. I also had to do sudo apt install virtualbox-guest-utils

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