VBox-Installation.md

@@ -9,7 +9,7 @@ If you want to run VirtualBox in Windows see [Installation on Windows](Win10 Ins
 
 ## Ubuntu 20.04 LTS Virtual Machine
  * Ubuntu 20.04 LTS Server installation.
- * 2 Gb of memory, 40 Gb disk, nat network.
+ * 2 Gb memory, 40 Gb disk, nat network.
  * OpenSSH-server running.
  * Geant4 10.6.3 and Root 6.22/02 preinstalled.
  * build-essential, curl, gnu g++, git and cmake packages.
@@ -51,7 +51,7 @@ From the command line you can use the command for import:
 
 `$ VBoxManage import g4vm-ubuntu-20.ova`
 
-## More VM customisation
+## More VM customisations
 
 You can use VirtualBox GUI to make additional modifications in VM.
 You can add disk, shared points, network interfaces, etc. by selecting
@@ -101,7 +101,7 @@ You can also stop the vm with host command:
 ## Tests
 
 In the vagrant home directory you can see the file _setup_env.sh_.
-You need to source this file before starting your worg with Geant4 or ROOT:
+You need to source this file before starting your work with Geant4 or ROOT:
 
 `. setup_env.sh`
 
@@ -131,7 +131,10 @@ passwd semenjuk
   - use *source* not *.* to source setup scripts
 
 - OpenGL
-  - If you see the errors when run exaples
+  - If you run vm on MacOS and see black screen when run examples via ssh connection, check _enable_iglx_ option in X11 server, it must be true.
+  `defaults write org.macosforge.xquartz.X11 enable_iglx -bool true`
+
+  - If you see the errors when run examples:
 ```
   libGL error: No matching fbConfigs or visuals found
   libGL error: failed to load driver: swrast