link to KVM docs from GTK error

README.md

@@ -496,11 +496,15 @@ docker run \
 
 Big thank you to our contributors who have worked out almost every conceivable issue so far!
 
-### LibGTK - Permission denied
-
 [https://github.com/sickcodes/Docker-OSX/blob/master/CREDITS.md](https://github.com/sickcodes/Docker-OSX/blob/master/CREDITS.md)
 
-#### libgtk permissions denied error
+#### LibGTK
+
+You may see a LibGTK-related error if you do not have everything you need set up for hardware virtualisation yet. If you have not yet done so, check out the [KVM on the host](https://github.com/kaoudis/Docker-OSX#requirements-kvm-on-the-host) section.
+
+##### LibGTK: permissions denied error
+
+If you are fully set up with KVM, the issue may be with X11/Xorg:
 
 ```bash
 echo $DISPLAY
@@ -549,9 +553,9 @@ Swap:           11Gi          0B        11Gi
 
 Of course you cannot allocate more RAM that your have. The default is 3 Gigabytes: `-e RAM=3`.
 
-#### PulseAudio
+### PulseAudio
 
-### Use PulseAudio for sound 
+#### Use PulseAudio for sound
 
 Note: [AppleALC](https://github.com/acidanthera/AppleALC), [`alcid`](https://dortania.github.io/OpenCore-Post-Install/universal/audio.html) and [VoodooHDA-OC](https://github.com/chris1111/VoodooHDA-OC) do not have [codec support](https://osy.gitbook.io/hac-mini-guide/details/hda-fix#hda-codec). However, [IORegistryExplorer](https://github.com/vulgo/IORegistryExplorer) does show the controller component working.
 
@@ -576,7 +580,7 @@ docker run \
     sickcodes/docker-osx pactl list
 ```
 
-#### Nested Hardware Virtualization
+### Nested Hardware Virtualization
 
 Check if your PC has hardware virtualization enabled:
 
@@ -586,7 +590,7 @@ sudo tee /sys/module/kvm/parameters/ignore_msrs <<< 1
 egrep -c '(svm|vmx)' /proc/cpuinfo
 ```
 
-### Routine checks
+## Routine checks
 
 #### Confirm that your CPU supports virtualization