I am experiencing the very same issue on a fresh installation of Kubuntu 21.04. fc-list shows that Fantasque Sans has been installed in multiple styles, stylistic sets and font formats:
$ fc-list | grep -i fantasque /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight-NoLoopK/TTF/FantasqueSansMono-Regular.ttf: Fantasque Sans Mono:style=Regular /usr/share/fonts/opentype/fantasque-sans/NoLoopK/OTF/FantasqueSansMono-Bold.otf: Fantasque Sans Mono:style=Bold /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight/OTF/FantasqueSansMono-Italic.otf: Fantasque Sans Mono:style=Italic /usr/share/fonts/woff/fantasque-sans/FantasqueSansMono-Bold.woff: Fantasque Sans Mono:style=Bold /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight-NoLoopK/TTF/FantasqueSansMono-Bold.ttf: Fantasque Sans Mono:style=Bold /usr/share/fonts/opentype/fantasque-sans/Normal/OTF/FantasqueSansMono-Bold.otf: Fantasque Sans Mono:style=Bold /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight-NoLoopK/OTF/FantasqueSansMono-Regular.otf: Fantasque Sans Mono:style=Regular /usr/share/fonts/woff/fantasque-sans/FantasqueSansMono-Regular.woff: Fantasque Sans Mono:style=Regular /usr/share/fonts/opentype/fantasque-sans/NoLoopK/OTF/FantasqueSansMono-Italic.otf: Fantasque Sans Mono:style=Italic /usr/share/fonts/woff/fantasque-sans/FantasqueSansMono-BoldItalic.woff: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/truetype/fantasque-sans/NoLoopK/TTF/FantasqueSansMono-Bold.ttf: Fantasque Sans Mono:style=Bold /usr/share/fonts/truetype/fantasque-sans/Normal/TTF/FantasqueSansMono-BoldItalic.ttf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/opentype/fantasque-sans/NoLoopK/OTF/FantasqueSansMono-BoldItalic.otf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/truetype/fantasque-sans/NoLoopK/TTF/FantasqueSansMono-Regular.ttf: Fantasque Sans Mono:style=Regular /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight/TTF/FantasqueSansMono-Regular.ttf: Fantasque Sans Mono:style=Regular /usr/share/fonts/truetype/fantasque-sans/NoLoopK/TTF/FantasqueSansMono-BoldItalic.ttf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight/TTF/FantasqueSansMono-BoldItalic.ttf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight/OTF/FantasqueSansMono-BoldItalic.otf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/opentype/fantasque-sans/Normal/OTF/FantasqueSansMono-BoldItalic.otf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight-NoLoopK/TTF/FantasqueSansMono-Italic.ttf: Fantasque Sans Mono:style=Italic /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight/OTF/FantasqueSansMono-Regular.otf: Fantasque Sans Mono:style=Regular /usr/share/fonts/truetype/fantasque-sans/NoLoopK/TTF/FantasqueSansMono-Italic.ttf: Fantasque Sans Mono:style=Italic /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight-NoLoopK/OTF/FantasqueSansMono-Bold.otf: Fantasque Sans Mono:style=Bold /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight-NoLoopK/OTF/FantasqueSansMono-Italic.otf: Fantasque Sans Mono:style=Italic /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight/TTF/FantasqueSansMono-Bold.ttf: Fantasque Sans Mono:style=Bold /usr/share/fonts/woff/fantasque-sans/FantasqueSansMono-Italic.woff: Fantasque Sans Mono:style=Italic /usr/share/fonts/truetype/fantasque-sans/Normal/TTF/FantasqueSansMono-Regular.ttf: Fantasque Sans Mono:style=Regular /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight/TTF/FantasqueSansMono-Italic.ttf: Fantasque Sans Mono:style=Italic /usr/share/fonts/opentype/fantasque-sans/Normal/OTF/FantasqueSansMono-Italic.otf: Fantasque Sans Mono:style=Italic /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight-NoLoopK/OTF/FantasqueSansMono-BoldItalic.otf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/truetype/fantasque-sans/Normal/TTF/FantasqueSansMono-Italic.ttf: Fantasque Sans Mono:style=Italic /usr/share/fonts/truetype/fantasque-sans/Normal/TTF/FantasqueSansMono-Bold.ttf: Fantasque Sans Mono:style=Bold /usr/share/fonts/opentype/fantasque-sans/LargeLineHeight/OTF/FantasqueSansMono-Bold.otf: Fantasque Sans Mono:style=Bold /usr/share/fonts/opentype/fantasque-sans/NoLoopK/OTF/FantasqueSansMono-Regular.otf: Fantasque Sans Mono:style=Regular /usr/share/fonts/truetype/fantasque-sans/LargeLineHeight-NoLoopK/TTF/FantasqueSansMono-BoldItalic.ttf: Fantasque Sans Mono:style=Bold Italic /usr/share/fonts/opentype/fantasque-sans/Normal/OTF/FantasqueSansMono-Regular.otf: Fantasque Sans Mono:style=Regular It also turns out, that the font works in some applications like the systemsettings application or alacritty (installed via Snap) but not in others like rofi or termite (built from source). Might it be that some of these files are broken, so that programs using one font format work fine but others only see the broken font? Alternatively, the font files themselves could be in order, but the font configuration pushes a version (maybe woff?) that is not universally understood by all programs? As a workaround, I have uninstalled the package and built the font from source, installing it locally into my account: $ fc-list | grep -i fantasque /home/adaephon/.fonts/FantasqueSansMono-Regular.ttf: Fantasque Sans Mono:style=Regular /home/adaephon/.fonts/FantasqueSansMono-Bold.ttf: Fantasque Sans Mono:style=Bold /home/adaephon/.fonts/FantasqueSansMono-BoldItalic.ttf: Fantasque Sans Mono:style=Bold Italic /home/adaephon/.fonts/FantasqueSansMono-Italic.ttf: Fantasque Sans Mono:style=Italic This not only results in a much shorter list of fonts, but also seems to work for all applications I have tested until now. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1941615 Title: fonts-fantasque-sans font displays numeric codes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fonts-fantasque-sans/+bug/1941615/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs