On 2014-07-14 09:25, Lukas Bunsen wrote:
> If I change the locale in my existing installation to simplified
> Chinese, all Chinese text is displayed correctly. (fonts-droid
> installed and language-selector-common updated to the Utopic
> version.)

Ok, with that we know that the fontconfig settings make a difference
also for KDE/QT apps.

> I also installed Kubuntu 14.04 with German locale in a virtual
> machine and applied all updates. In the fresh installation the
> problem is slightly different: In Chinese text, some characters are
> not displayed at all, instead the standard squares that are used when
> a font doesn't include the required characters are displayed.

Hmm.. I have a test installation of Kubuntu which I upgraded to try to
reproduce the problem. I couldn't.

Sure, if I uninstalled fonts-droid, those squares showed up when viewing
a piece of Chinese text with Kate, but with fonts-droid the text seemed
to be rendered normally. (Please see attachment.) So I can't help
wondering if fonts-droid was installed when you tested on your VM.

Another thing struck me: The list of Droid fonts at
https://launchpadlibrarian.net/178980889/select%20system%20font.png
is much shorter than the list I saw in the font select window (see attachment). 
Especially I miss Droid Sans Fallback, which is essential for CJK languages.

Can you please ensure that the fonts-droid package is completely
installed on your existing installation by running

sudo apt-get install --reinstall fonts-droid

Can you also post the output of the command

fc-match -a 'sans-serif'

** Attachment added: "fonts-droid-tests.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/fonts-droid/+bug/1334495/+attachment/4153498/+files/fonts-droid-tests.tar.gz

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https://bugs.launchpad.net/bugs/1334495

Title:
  Two mixed fonts when rendering Chinese in KDE/QT apps with Droid Sans
  fonts

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