X11 on Ubuntu, all characters missing, while working fine with Xming on Windows

I tried to access a server with GUI through X11 on a PC with Ubuntu. The forwarding seems good, just with all characters missing:screenshot_ubuntu_X11

However, I also tried to use PuTTY and Xming on Win10 to connect the same server, and everything works fine:screenshot_win10_Xming

I thought it could be a font issue. But I tried to install several xfont packages and it doesn't help. I also tried this: https://github.com/zub2/xfonts-ucs

What the actual problem could be and how to fix it?

Thanks to all reading this!