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Frequently when visiting a web page such as YouTube or Wikipedia or other sites there will be squares containing four hexadecimal digits on the page. I assume these are characters which have no symbol in the font being used to display the page. In some cases they are emoji or silly Unicode graphics.

What am I supposed to do to make the web browser display the characters intended by the author of the page? I will try to upload one or more sample screenshots to be clear, but I suspect I'm not the only one who's ever faced this issue.

sample 1

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You need a font for rendering Thai characters. Try:

sudo apt install fonts-thai-tlwg

Edit:

To end up with that recommendation I saw via the URL that it was the Thai version of Wikipedia. Then there is the file /usr/share/language-selector/data/pkg_depends in Ubuntu which (among other things) specifies default font packages for certain languages. So the command:

cat /usr/share/language-selector/data/pkg_depends | grep ^fn:th

gave me a suitable font package.

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  • It's already installed. I'll check again though.
    – takatakatek
    Jun 11, 2017 at 1:56
  • You were right the package was not installed. After installing it only some of the characters are displayed as intended. Specifically the title bar of the Firefox window is just a string of squares as in the picture.
    – takatakatek
    Jun 11, 2017 at 2:05
  • I can't upload another screenshot so I hope you can see the title bar in the original because that's still what it looks like.
    – takatakatek
    Jun 11, 2017 at 2:13
  • @takatakatek: Have you tried to restart Firefox?
    – Gunnar Hjalmarsson
    Jun 11, 2017 at 2:19
  • I rebooted the computer and now all the text is displayed as intended (I think). Can you please explain how you knew a font needed to be installed and which one and how to find the package name?
    – takatakatek
    Jun 11, 2017 at 2:34

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