I am using IBus for pinyin in Ubuntu 18.04 (Gnome), with the "intelligent pinyin" input method.

The Chinese characters in the preview box are way too small and barely legible, i.e.:

enter image description here

What I tried:

~$ ibus-setup
~$ # I ticked option "Use custom font" and set very large font size
~$ ibus restart                        # (rebooting the machine also has no effect)

This did not change the font of the characters in the preview box.

NOTE (not a duplicate): the troubleshooting I followed is similar to the one proposed here for a previous version of Ubuntu (11.10). The approach described in the previous Q/A does not seem to be valid any longer, so I made a new question because this issue deserves some renewed attention. It is perhaps worth mentioning that the same troubleshooting was working on the most recent Linux Mint+Cinammon release, so the issue seems to be related with Ubuntu+Gnome.

  • Have you checked out if that method to increase the font size is effective with some other input method, e.g. ibus-sunpinyin? May 1, 2018 at 22:29
  • @GunnarHjalmarsson I tried several ones for Chinese language, and all of them display the same font size for the preview box. Actually, I suspect that ibus-setup configuration is not really being used by the OS, since when I add some new input-method through system settings this is not listed under ibus-setup. The thing is, system settings does not show any option to change the font size AFAIK. May 1, 2018 at 22:54

1 Answer 1


I found this bug:


with the advice to install this extension:


  • 2
    That's neat, 謝謝! May 1, 2018 at 23:00
  • Thank you so much for this answer, and thank-you to extensions.gnome.org/accounts/profile/epico for creating the extension. On a high-res / high-DPI setup, the suggestions would truly be useless without this fix, because the default font size ends up being so small. Nov 2, 2020 at 0:47

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