• NI Linux RT uses the Xfce Desktop Environment (see here)

  • Xfce Manual

• Which NI Real-Time Targets Support Embedded UI?

  • Archived: Real-Time Controllers and Real-Time Operating System Compatibility

• Embedded User Interface Doesn't Look Like Host User Interface

• My cRIO Not Shows the Screen When Disconnect It and Reconnected

If you're in LabVIEW 2021 or earlier, you can use this INI token to allow VIs with subpanels to be downloaded to an RT target with embedded UI enabled:

  RTAllowDownloadSubPanels=True

For LabVIEW 2022 Q3 and later, subpanels are allowed to be downloaded to an RT target without error and without requiring the INI token when embedded UI is enabled.

Sometimes the fonts are not correct installed on the target system. To fix this, open a terminal, login as admin (remote per SSH or locally) and execute the following command. After a restart of the controller the fonts should look properly.

>> find /usr/share/fonts/X11 -type d -print0 | xargs -0 mkfontdir

See also: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P7i1SAC