Created attachment 115500 [details] simple example html file SUMMARY KDE Neon upgraded to 18.04 seems to have broken something with how Firefox uses ttf-mscorefonts, and it will no longer use Arial, Times New Roman, etc. Instead it defaults back to the Noto font family. Note that this is NOT about mapping "sans-serif"->Arial as a default font. When the font is explicitly set to Arial, with no fallbacks, it is not used. I've attached a sample html file below, it just shows examples of font-family:arial, etc.: <p style="font-family: arial">This should be Arial</p> STEPS TO REPRODUCE 1. With a fresh install of KDE Neon 18.04 (optional?) 2. Open the test file with Firefox. 3. right click the text -> inspect element. In the inspector at the bottom right, choose 'computed' to see the font family is supposed to be Arial, etc. Choose 'Fonts' to see that Firefox chose 'Noto Serif' 4. run 'sudo apt-get install ttf-mscorefonts-installer' and follow prompts to install. 5. reboot and/or reopen firefox with the same file. Re-inspect the same element and see the effective font. OBSERVED RESULT Font is still shown as the Noto family. EXPECTED RESULT Font should be Arial (or Verdana, Times New Roman, etc.) SOFTWARE VERSIONS (available in About System) KDE Plasma Version: 5.13.5 KDE Frameworks Version: 5.50.0 Qt Version: 5.11.1 Firefox Version: 62.0.3 KDE Neon user edition neon-useredition-20181004-1723-amd64.iso ADDITIONAL INFORMATION I performed the steps above with a fresh KDE Neon ISO in a VM, and again with an Ubuntu 18.04.1 ISO. Installing mscorefonts works in Ubuntu, so it appears to be something specific to KDE/KDE Neon.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!