Today, with a newer MacOS and a more recent Ubuntu, I am encountering similar but distinct problems, and the older (and useful) advice I got here no longer seems to apply, hence this new topic.
I have a working Ubuntu 22.04 LTS guest on my Mojave 10.14.6 Mac host. I have also successfully installed Guest Additions (in the guest shell, the command
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lsmod |grep vboxguest
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vboxguest 45056 7 vboxsf
In the VirtualBox "Shared Folders" menu dialog, I have also defined one item, with "Access" set to "Full", "AutoMount" to "Yes" and left the "At" field blank.
So, after rebooting my guest, my Shared Folder should now be ready to use, right ?
Well, no.
What happens in the guest is this : there is indeed a `/media/sf_downloads` directory present as it should, but
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ls /media/sf_downloads