Comment 7 for bug 1189352

Please reproduce the issue by running fc-cache again after you follow comment #4[1].

$ sudo fc-cache -f -r -s -v

It seems apt-get triggered fontconfig update it's cache before the config[2] file is in place. Please updatethe cache and reboot.

After reboot you will see the chinese word as box, it seems like qt5 fontdatabase does not handle the language fallback correctly.

[1] https://bugs.launchpad.net/ubuntu-ui-toolkit/+bug/1189352/comments/4
[2] /etc/fonts/conf.d/65-droid-sans-fonts.conf