Shared folders which are automatically mounted via Shared Folders configuration get the following permissions per default:
root:vboxsf with permission 0770
Per default, nobody is in the
vboxsf group, you have to manually add one. Here come’s the oddity. In
the following line is present:
group: files altfiles systemd
which means, the system looks for groups at first in
/etc/group, then in
/usr/lib/group and at last in the corresponding systemd module. The group
vboxsf is defined in
/usr/lib/group which is located in a read-only location, so the usual tools like
adduser fail to add the user to the group:
sudo adduser egon vboxsf
Adding user `egon' to group `vboxsf' ... gpasswd: group 'vboxsf' does not exist in /etc/group adduser: `/bin/gpasswd -a egon vboxsf' returned error code 3. Exiting.
To work around the issue, you have to insert the corresponding line from
Then the usual commands for adding the user to the group work again.