VirtualBox Bidirectional Copy/Paste not working

[buglab]

I am running kali-linux-2020-1-vbox-amd64-ova in VirtualBox 6.0.16 on OS X 10.14.6. I have set both "Shared Clipboard" and "Drag and Drop" to "Bidirectional", but neither clipboard sharing nor drag and drop are working in either direction.

I found this kali forums question from 2016 and followed the instructions about purging virtualbox-guest-x11 and reinstalling. The problem remains.

VBoxClient is definitely installed and running:

kali@kali ~ % systemctl status -l virtualbox-guest-utils.service
● virtualbox-guest-utils.service - Virtualbox guest utils
     Loaded: loaded (/lib/systemd/system/virtualbox-guest-utils.service; enabled; vendor preset: enabled)
     Active: active (running) since Mon 2020-02-17 12:22:23 EST; 5min ago
    Process: 492 ExecStart=/etc/init.d/virtualbox-guest-utils start (code=exited, status=0/SUCCESS)
      Tasks: 11 (limit: 2320)
     Memory: 8.9M
     CGroup: /system.slice/virtualbox-guest-utils.service
             ├─534 /usr/bin/VBoxClient --vmsvga
             ├─535 /usr/bin/VBoxClient --vmsvga
             └─539 /usr/sbin/VBoxService

Here is what `ps` looks like:

kali@kali ~ % ps -ef | grep VBoxClient
root         534       1  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --vmsvga
root         535     534  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --vmsvga
kali         797       1  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --display
kali         799     797  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --display
kali         806       1  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --seamless
kali         813     806  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --seamless
kali         815       1  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --draganddrop
kali         820     815  0 12:22 ?        00:00:00 /usr/bin/VBoxClient --draganddrop
kali        1244    1194  0 12:28 pts/0    00:00:00 grep VBoxClient

I also found a post on StackExchange which suggested that I try `VBoxClient --clipboard`. While that didn't end in an error, it also didn't work. And `VBoxClient --clipboard` doesn't show up in `ps -ef` either.

I even tried modifying /etc/init.d/virtualbox-guest-utils to add this as line 63:

/usr/bin/VBoxClient --clipboard

But on reboot, the clipboard still didn't show in ps -ef—and of course the clipboard still isn't being shared.


As for drag and drop, when I try this in either direction I get an error like this:

Drag and drop operation from guest to host failed.
Drag and drop error from guest (VERR_INVALID_PARAMETER).
Result Code:
VBOX_E_IPRT_ERROR (0x80BB0005)
Component:
GuestWrap
Interface:
IGuest {13a11514-402e-022e-6180-c3944de3f9c8}

I don't know if the shared folder is managed by virtualbox-guest-x11 and friends, but that IS working.

I'm out of ideas at this point, so I thought I would ask here. Thanks in advance for any ideas!