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Try this first, since it's more likely to solve any keyboard layout mismatches and it's very simple to apply. It may look like it consists of a long number of steps, but only because they're very detailed. Also, not everyone will need to go through all of them.

Don't make any changes to the keyboard settings in the system preferences of your Mac. Leave it as British keyboard, so you don't have any issues with other applications unrelated to VDI.

1. Open your Horizon VDI client.
2. Open a text editor or terminal and type some control characters.
3. If everything works as expected, you don't need to do anything.
4. If some keys produce the wrong characters, start the "Settings" application in Linux VDI, go to "Region & Language" in the left pane.
5. Click the plus sign  
6. Select "English (United Kingdom)".
7. A list of variants will appear. Find "English (UK, Macintosh)" and select it, so your "input sources" panel looks similar to this:
   
   
   
   
8. Now at the top bar you will be able to switch between layouts depending on the client you're using:
   
   
   
   
9. If you click "Show Keyboard Layout", you will see a visual representation of the full keyboard. Of course, your physical keyboard may lack some of the keys that are shown here, such as the numeric keypad, but it's a good way to check and compare:
   
   
   
   
10. If you don't plan to use different input methods, you can delete the "English (UK)" one, or move it to the bottom in the settings.
11. Now try to type some control characters again. If everything works as expected, you don't need to do anything else.
12. If there are still some mismatches between the key presses and the output they produce, go to "Menu > Preferences > Keyboard & Mouse tab > Key Mappings" in your VMware Horizon Client.
13. Uncheck the option "Enable Language Specific Key Mappings":
    
    
    
    
14. Try to type some control characters again. If everything works, you don't need to do anything else.
15. However, there's a common issue with two very specific keys. If you see that the keys left to "1" and "Z" respectively (§ and ` characters) are swapped, you can tweak their mappings manually.
16. In your VMware Horizon Client, go to "Menu > Preferences > Keyboard & Mouse tab > Key Mappings" again.
17. Click the plus sign 
18. In the dialog that pops up, create a new entry to replace (from) the § character with (to) the ` character. Leave everything else untouched.
19. Click "OK".
20. Click the plus sign  again
21. In the dialog that pops up, create a new entry to replace (from) the ` character with (to) the § character. Leave everything else untouched.
22. Click "OK".
23. Now, your preferences dialog should look like this:
    
    
    
    
24. Try for one last time to type some control characters. Everything should work as expected now. Otherwise, try solution 2.

Procedure defined and tested by Daniel Ali, with thanks to Steffen Tietscheand Lennart Sorthfor their help.

Solution 2

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