The fonts of XP are stored in the c:/windows/fonts directory, and we copy our favorite fonts, such as simsun.ttc, simkai.ttf, simhei.ttf, simfang.ttf and so on. Copy these font files to Ubuntu's /usr/share/fonts/xpfonts directory.

Note: If you find it impossible to create a new folder under /usr/share/fonts/, please log in as root.

Sudo apt-get installs xfonts-utils.

Open a terminal and run the following command line to establish font cache information:

cd xpfonts

sudo mkfontscale

sudo mkfontdir

Sudo apt-get installs fontconfig.

sudo fc-cache -fv

After the command is successfully executed, the terminal will display:

Fc-cache: success

Then sudo su-

CD/usr/share/font

tar cv * | docker exec-I only office-document-server tar x-C/usr/share/fonts/

docker exec only office-document-server documentserver-generate-all fonts . sh

Then clear the cache browser and log in again.

Source:/onlyoffice/documentserver/issues/7