I have installed a fresh Ubuntu Gnome 15.10 and I have a problem with italic font. Here's a screen shot :
The text inside italic tag on Wikipedia is not rendered. How can I install the missing italic fonts?
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First check that the meta-package for your desktop environment is installed correctly, since it depends on the base font packages. In your case that is:
sudo apt-get install ubuntu-gnome-desktop
If the first step didn't pull in any new packages or the problem persists anyway, the base font packages seem to be broken and you need to re-install them:
sudo apt-get install --reinstall fonts-cantarell fonts-dejavu-core fonts-freefont-ttf
In the future, to detect packages with broken or missing files early you can use the
debsums program and package, which comes with a Cron script to check package integrity on a weekly basis.