I made some changes to this bug report, such as replacing fontconfig with plasma-desktop as the affected package. While I'm not sure about that either, it's a way to call the Kubuntu developers' attention to the issue.
** Package changed: fontconfig (Ubuntu) => plasma-desktop (Ubuntu) ** Changed in: plasma-desktop (Ubuntu) Status: Incomplete => New ** Summary changed: - Font hinting broken on 23.04 + Font hinting broken on Plasma 23.04 ** Tags added: lunar regression-release -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to fontconfig in Ubuntu. https://bugs.launchpad.net/bugs/2017573 Title: Font hinting broken on Plasma 23.04 Status in plasma-desktop package in Ubuntu: New Bug description: Just upgraded my laptops to Kubuntu 23.04 Lunar Lobster and hinting for all non-commercial fonts seems broken. I used to have decent if not perfect hinting on Ubuntu and Ubuntu Mono font, but now the only fonts that still hint correctly are Microsoft's Verdana and Tahoma etc. Not sure whether the devide is exactly along this line, but it stands out. Tried regenerating font cache (fc-cache -rv) but that didn't help. Operating System: Kubuntu 23.04 KDE Plasma Version: 5.27.4 KDE Frameworks Version: 5.104.0 Qt Version: 5.15.8 Kernel Version: 6.3.0 (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ i7-10510U CPU @ 1.80GHz Memory: 31.1 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics Manufacturer: Notebook Product Name: N141CU System Version: Not Applicable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/2017573/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp