Ubuntu ARM64: Chinese Characters Display as Squares #10666

Bug Description

Description:
I am using RustDesk on Ubuntu ARM64, and Chinese characters are displayed as squares (tofu boxes). This issue makes it difficult to read text properly.

How to Reproduce

Steps to reproduce:

Install RustDesk on Ubuntu ARM64.
Open the application and switch the language to Chinese (Simplified or Traditional).
Observe that all Chinese text is displayed as squares instead of proper characters.

Expected Behavior

Expected behavior:
Chinese characters should be displayed correctly using an appropriate font, such as Noto Sans CJK or WenQuanYi Micro Hei.

Actual behavior:
Chinese text appears as squares, indicating a missing font or incorrect font configuration.

System Information:

OS: Ubuntu 22.04 ARM64
RustDesk Version: [Provide the version]
Installation Method: AppImage / Snap / DEB package
Additional Information:

I have installed the necessary fonts (, ), but RustDesk does not seem to use them.fonts-noto-cjkfonts-wqy-microhei
Running confirms that Chinese fonts are available on the system.fc-list :lang=zh
Setting environment variables like does not fix the issue.QT_QPA_FONTDIR
Other Qt applications on the system display Chinese text correctly.
Would it be possible to add better font fallback support or allow users to specify the font manually in the settings?

Thank you for your time!

Operating system(s) on local (controlling) side and remote (controlled) side

OS: Ubuntu 22.04 ARM64

RustDesk Version(s) on local (controlling) side and remote (controlled) side

1.3.7

Screenshots

Additional Context

No response