Alt keys not working properly in Citrix Workspace under Ubuntu 20.04

Question

I'm using Citrix Workspace on Ubuntu 20.04 (while loggin on to a Windows environment). Everything works fine, except that there's a problem with the ALT keys. It appears as if Citrix was sending both left and right ALT keys at the same time, whichever key I'm pressing. As a result, some applications are confused and interprete the ALT-key combination as a menu shorthand, while others interprete it as a special character keystroke. With the current situation, I can't properly type \, {, }, #, @, etc. I tried modifying some values in All_Regions.ini, but either I'm using the wrong keys/values, or they don't have any effect.

Relevant section in All_Regions.ini:

[Virtual Channels\Keyboard]
TransparentKeyPassthrough=
KeyPassthroughEscapeChar=
KeyPassthroughEscapeShift=
UseLocalIM=
KeyboardLayout=
KeyboardType=
KeyboardSendLocale=
KeyboardTimer=*
UseEUKS=*
UseEUKSforASCII=*
SETLEDPos=4
EUKSModeMask=*
ScancodeEnabled=*
KeyboardMappingFile=
UnicodeKeyboard=
LocaleKeyMapping=
SuperMetaToWinKeys=
RightSuperMetaToWinKey=
BalanceShiftKeys=*
BalancedShiftMask=*
EchoShiftKeys=*
MSLocaleNumber=*
BypassSetLED=
ServerDoesMultiMod=*
BloombergRedirection=*

Answer 1

Try this Citrix support article and see if it works for you also.

• Log into Windows and type "ease" (and select Ease of access center)
• Select Make my keyboard easier to use
• Select Turn on Filter Keys checkbox
• Click on Set up Filter Keys (opens new window)
• Select Turn on Filter Keys checkbox (in the new window).
• Click Set up Repeat Keys and Slow Keys (opens new window).
• Click Ignore all Repeated Keystrokes
• Under the header Avoid Accidental Keystrokes set it to "0.0 Seconds"
• Click Apply

Answer 2

There is indeed an issue with the Citrix client, where both the left and right Alt keys are interpreted the same. This makes it more difficult to enter foreign characters under the right Alt key, sometimes labeled as AltGr, the Alt Graph key.

That is probably due to how the communication between your console and the Citrix server is set up. As a work around, you still can enter AltGr characters by

1. Pressing AltGr and releasing it
2. Pressing AltGr again in combination with the key needed for the special character.

Where possible, you can rely on the dead key combinations, which work as usual in Citrix applications.