Fonts – Fixing TTF Font Rendering Issues in LibreOffice

/etc/fonts/conf.d/70-no-bitmaps.conf only rejects bitmap fonts, they don't disable embedded bitmaps, which is the case here. I don't know why they didn't put the setting to disable embedded bitmaps in the same conf file. Anyways, put the following in your ~/.config/fontconfig/conf.d/20-no-embedded.conf (or, for older versions of Ubuntu, in ~/.fonts.conf.d/20-no-embedded.conf):

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <match target="font">
    <edit name="embeddedbitmap" mode="assign">
      <bool>false</bool>
    </edit>
  </match>
</fontconfig>

This will disable embedded bitmap for all fonts. If you want to disable only for select fonts, add <test> element:

<test name="family" compare="contains">
  <string>Calibri</string>
  <string>Cambria</string>
</test>

before <edit ....

I've found a solution for this problem. To do that you have to paste the fonts in the directory

~/.local/share/fonts

It's important to mention here that, normally, you can't see the folders which started with a dot(.)(in ubuntu folders started with . are hidden folders). To see these folders press ctrl+h or click view > show hidden files.

Now if you don't have a folder named fonts in ~/.local/share/, then create one and paste your desired fonts in that folder.

This solution worked for me; hope it can help others.