/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 ...
.