I have installed many packages from Flathub on my PC (RHEL 9) but many of these (g4music, Amberol, Color Picker, etc.) can't be displayed properly. See next pictures:
As you can see, these applications are unusable. So, I need your help to solve this problem.
Terminal output for g4music is next:
Enable ReplayGain: false Enable Pipewire: false Found 696 songs in 0.004244 seconds Parse MP4 Error read_all (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.108: failed to create cairo scaled font, expect ugly output. the offending font is 'Cantarell Bold 9' (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.108: font_face status is: file not found (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.108: scaled_font status is: file not found (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.109: failed to create cairo scaled font, expect ugly output. the offending font is 'Cantarell Bold 9' (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.109: font_face status is: file not found (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.109: scaled_font status is: file not found (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.109: failed to create cairo scaled font, expect ugly output. the offending font is 'Cantarell 11' (com.github.neithern.g4music:2): Pango-WARNING **: 20:55:18.109: font_face status is: file not found
Terminal output for Color Picker is next:
(gcolor3:2): Pango-WARNING **: 20:58:35.707: failed to create cairo scaled font, expect ugly output. the offending font is 'Cantarell 11' (gcolor3:2): Pango-WARNING **: 20:58:35.707: font_face status is: file not found (gcolor3:2): Pango-WARNING **: 20:58:35.707: scaled_font status is: file not found (gcolor3:2): Pango-WARNING **: 20:58:35.708: failed to create cairo scaled font, expect ugly output. the offending font is 'Cantarell 11' (gcolor3:2): Pango-WARNING **: 20:58:35.708: font_face status is: file not found (gcolor3:2): Pango-WARNING **: 20:58:35.708: scaled_font status is: file not found ** (gcolor3:2): WARNING **: 20:58:35.712: Cannot count number of items: Key file does not have group “Colors”
It seems there's a problem with fonts but I don't have experience with this topic.
Why is this happening?



