I fixed the issue deleting some fontconfig configurations in my home folder. I don't really know how this caused the issue, and how the files were created in first place.
Use with caution: rm -rf ~/.local/share/fontconfig ~/.fonts.conf.d ~/.fonts.conf ** Changed in: nvidia-graphics-drivers-390 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to nvidia-graphics-drivers-390 in Ubuntu. https://bugs.launchpad.net/bugs/1794847 Title: Installing proprietary drivers causes font glitches Status in nvidia-graphics-drivers-390 package in Ubuntu: Invalid Bug description: I recently enabled the nvidia proprietary drivers and since then I'm experiencing font glitches which are making it difficult for me to read the text. The glitch consist in slight "shadow" lines on the right or left of a letter, in red or green. I recently also installed wine and wine-staging, with their recommended packages. My graphic card is an optimus one, so I have both an nvidia and Intel card. Unfortunately when I try to switch back to the Intel card, the nouveau drivers are loaded instead, so I cannot test if reverting to Intel can solve the glitch. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: nvidia-driver-390 390.48-0ubuntu3 ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18 Uname: Linux 4.15.0-34-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu Sep 27 20:30:28 2018 InstallationDate: Installed on 2017-08-21 (402 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170820) SourcePackage: nvidia-graphics-drivers-390 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1794847/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp