snap issue with fontsconfig on Ubuntu 20.04

Operating system: Ubuntu 20.04

I welcome any suggestion/solution to solve this issue.

Using snap, I can remove snaps but when I want to install any snap, I get the following error:

$ sudo snap install darktable 
[sudo] password for aaron: 
error: cannot perform the following tasks:
- Run configure hook of "darktable" snap if present (run hook "configure": 
-----
Fontconfig error: "/etc/fonts/conf.d/69-unifont.conf", line 6: invalid attribute 'xmlns:its'
Fontconfig error: "/etc/fonts/conf.d/69-unifont.conf", line 6: invalid attribute 'version'
Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 4: unknown element "its:rules"
Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 5: unknown element "its:translateRule"
Fontconfig error: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 5: invalid attribute 'translate'
Fontconfig error: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 5: invalid attribute 'selector'
Fontconfig error: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 6: invalid attribute 'xmlns:its'
Fontconfig error: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 6: invalid attribute 'version'
Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 8: unknown element "description"
Fontconfig warning: "/etc/fonts/conf.d/80-delicious.conf", line 4: unknown element "its:rules"
Fontconfig warning: "/etc/fonts/conf.d/80-delicious.conf", line 5: unknown element "its:translateRule"
Fontconfig error: "/etc/fonts/conf.d/80-delicious.conf", line 5: invalid attribute 'translate'
Fontconfig error: "/etc/fonts/conf.d/80-delicious.conf", line 5: invalid attribute 'selector'
Fontconfig error: "/etc/fonts/conf.d/80-delicious.conf", line 6: invalid attribute 'xmlns:its'
Fontconfig error: "/etc/fonts/conf.d/80-delicious.conf", line 6: invalid attribute 'version'
Fontconfig warning: "/etc/fonts/conf.d/90-synthetic.conf", line 4: unknown element "its:rules"
Fontconfig warning: "/etc/fonts/conf.d/90-synthetic.conf", line 5: unknown element "its:translateRule"
Fontconfig error: "/etc/fonts/conf.d/90-synthetic.conf", line 5: invalid attribute 'translate'
Fontconfig error: "/etc/fonts/conf.d/90-synthetic.conf", line 5: invalid attribute 'selector'
Fontconfig error: "/etc/fonts/conf.d/90-synthetic.conf", line 6: invalid attribute 'xmlns:its'
Fontconfig error: "/etc/fonts/conf.d/90-synthetic.conf", line 6: invalid attribute 'version'
/usr/share/fonts: caching, new cache contents: 0 fonts, 6 dirs
/usr/share/fonts/X11: caching, new cache contents: 0 fonts, 4 dirs
/usr/share/fonts/X11/Type1: caching, new cache contents: 8 fonts, 0 dirs
/usr/share/fonts/X11/encodings: caching, new cache contents: 0 fonts, 1 dirs
/usr/share/fonts/X11/encodings/large: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/X11/misc: caching, new cache contents: 89 fonts, 0 dirs
/usr/share/fonts/X11/util: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cMap: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cmap: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/opentype: caching, new cache contents: 0 fonts, 6 dirs
/usr/share/fonts/opentype/cantarell: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/opentype/ipafont-gothic: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/opentype/ipafont-mincho: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/opentype/malayalam: caching, new cache contents: 7 fonts, 0 dirs
/usr/share/fonts/opentype/noto: caching, new cache contents: 28 fonts, 0 dirs
/usr/share/fonts/opentype/urw-base35: caching, new cache contents: 35 fonts, 0 dirs
/usr/share/fonts/truetype: caching, new cache contents: 2 fonts, 53 dirs
/usr/share/fonts/truetype/Gargi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Gubbi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Nakula: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Navilu: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Sahadeva: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Sarai: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/abyssinica: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/arphic: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/truetype/dejavu: caching, new cache contents: 22 fonts, 0 dirs
/usr/share/fonts/truetype/droid: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/farsiweb: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-beng-extra: caching, new cache contents: 6 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-deva-extra: caching, new cache contents: 3 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-gujr-extra: caching, new cache contents: 5 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-guru-extra: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-kalapi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-orya-extra: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-telu-extra: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-yrsa-rasa: caching, new cache contents: 10 fonts, 0 dirs
/usr/share/fonts/truetype/freefont: caching, new cache contents: 12 fonts, 0 dirs
/usr/share/fonts/truetype/kacst: caching, new cache contents: 15 fonts, 0 dirs
/usr/share/fonts/truetype/kacst-one: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/lao: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lato: caching, new cache contents: 18 fonts, 0 dirs
/usr/share/fonts/truetype/liberation: caching, new cache contents: 16 fonts, 0 dirs
/usr/share/fonts/truetype/liberation2: caching, new cache contents: 12 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-assamese: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-bengali: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-devanagari: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-gujarati: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-kannada: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-malayalam: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-oriya: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-punjabi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-tamil: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-tamil-classical: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-telugu: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/malayalam: caching, new cache contents: 10 fonts, 0 dirs
/usr/share/fonts/truetype/msttcorefonts: caching, new cache contents: 60 fonts, 0 dirs
/usr/share/fonts/truetype/noto: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/openoffice: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/padauk: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/truetype/pagul: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/samyak: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/samyak-fonts: caching, new cache contents: 3 fonts, 0 dirs
/usr/share/fonts/truetype/scheherazade: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/sinhala: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/tibetan-machine: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/tlwg: caching, new cache contents: 58 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-khmeros-core: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/ubuntu: caching, new cache contents: 14 fonts, 0 dirs
/usr/share/fonts/truetype/wqy: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/xmind: caching, new cache contents: 27 fonts, 0 dirs
/usr/share/fonts/type1: caching, new cache contents: 0 fonts, 2 dirs
/usr/share/fonts/type1/gsfonts: caching, new cache contents: 35 fonts, 0 dirs
/usr/share/fonts/type1/urw-base35: caching, new cache contents: 35 fonts, 0 dirs
/usr/local/share/fonts: caching, new cache contents: 0 fonts, 0 dirs
/home/aaron/.local/share/fonts: "/home/aaron/.local/share/fonts": Permission denied
/var/snap/darktable/common/fontconfig: cleaning cache directory
/var/cache/fontconfig: not cleaning unwritable cache directory
/snap/darktable/63/gnome-platform/usr/bin/fc-cache: failed
-----)

More information

$ dpkg-query -W fontconfig fontconfig-config 
fontconfig  2.13.1-2ubuntu3
fontconfig-config   2.13.1-2ubuntu3

The following is the output of fontconfig.log

$ cat /var/log/fontconfig.log 
Fontconfig error: Cannot load default config file
/usr/share/fonts: caching, new cache contents: 0 fonts, 6 dirs
/usr/share/fonts/X11: caching, new cache contents: 0 fonts, 4 dirs
/usr/share/fonts/X11/Type1: caching, new cache contents: 8 fonts, 0 dirs
/usr/share/fonts/X11/encodings: caching, new cache contents: 0 fonts, 1 dirs
/usr/share/fonts/X11/encodings/large: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/X11/misc: caching, new cache contents: 89 fonts, 0 dirs
/usr/share/fonts/X11/util: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cMap: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cmap: caching, new cache contents: 0 fonts, 5 dirs
/usr/share/fonts/cmap/adobe-cns1: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cmap/adobe-gb1: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cmap/adobe-japan1: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cmap/adobe-japan2: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/cmap/adobe-korea1: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/opentype: caching, new cache contents: 0 fonts, 6 dirs
/usr/share/fonts/opentype/cantarell: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/opentype/ipafont-gothic: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/opentype/ipafont-mincho: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/opentype/malayalam: caching, new cache contents: 7 fonts, 0 dirs
/usr/share/fonts/opentype/noto: caching, new cache contents: 28 fonts, 0 dirs
/usr/share/fonts/opentype/urw-base35: caching, new cache contents: 35 fonts, 0 dirs
/usr/share/fonts/truetype: caching, new cache contents: 2 fonts, 53 dirs
/usr/share/fonts/truetype/Gargi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Gubbi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Nakula: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Navilu: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Sahadeva: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/Sarai: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/abyssinica: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/arphic: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/truetype/dejavu: caching, new cache contents: 22 fonts, 0 dirs
/usr/share/fonts/truetype/droid: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/farsiweb: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-beng-extra: caching, new cache contents: 6 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-deva-extra: caching, new cache contents: 3 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-gujr-extra: caching, new cache contents: 5 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-guru-extra: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-kalapi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-orya-extra: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-telu-extra: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/fonts-yrsa-rasa: caching, new cache contents: 10 fonts, 0 dirs
/usr/share/fonts/truetype/freefont: caching, new cache contents: 12 fonts, 0 dirs
/usr/share/fonts/truetype/kacst: caching, new cache contents: 15 fonts, 0 dirs
/usr/share/fonts/truetype/kacst-one: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/lao: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lato: caching, new cache contents: 18 fonts, 0 dirs
/usr/share/fonts/truetype/liberation: caching, new cache contents: 16 fonts, 0 dirs
/usr/share/fonts/truetype/liberation2: caching, new cache contents: 12 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-assamese: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-bengali: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-devanagari: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-gujarati: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-kannada: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-malayalam: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-oriya: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-punjabi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-tamil: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-tamil-classical: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/lohit-telugu: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/malayalam: caching, new cache contents: 10 fonts, 0 dirs
/usr/share/fonts/truetype/msttcorefonts: caching, new cache contents: 60 fonts, 0 dirs
/usr/share/fonts/truetype/noto: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/openoffice: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/padauk: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/truetype/pagul: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/samyak: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/samyak-fonts: caching, new cache contents: 3 fonts, 0 dirs
/usr/share/fonts/truetype/scheherazade: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/sinhala: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/tibetan-machine: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/truetype/tlwg: caching, new cache contents: 58 fonts, 0 dirs
/usr/share/fonts/truetype/ttf-khmeros-core: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/ubuntu: caching, new cache contents: 14 fonts, 0 dirs
/usr/share/fonts/truetype/wqy: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/truetype/xmind: caching, new cache contents: 27 fonts, 0 dirs
/usr/share/fonts/type1: caching, new cache contents: 0 fonts, 2 dirs
/usr/share/fonts/type1/gsfonts: caching, new cache contents: 35 fonts, 0 dirs
/usr/share/fonts/type1/urw-base35: caching, new cache contents: 35 fonts, 0 dirs
/usr/share/fonts/X11: skipping, looped directory detected
/usr/share/fonts/cMap: skipping, looped directory detected
/usr/share/fonts/cmap: skipping, looped directory detected
/usr/share/fonts/opentype: skipping, looped directory detected
/usr/share/fonts/truetype: skipping, looped directory detected
/usr/share/fonts/type1: skipping, looped directory detected
/usr/share/fonts/X11/Type1: skipping, looped directory detected
/usr/share/fonts/X11/encodings: skipping, looped directory detected
/usr/share/fonts/X11/misc: skipping, looped directory detected
/usr/share/fonts/X11/util: skipping, looped directory detected
/usr/share/fonts/cmap/adobe-cns1: skipping, looped directory detected
/usr/share/fonts/cmap/adobe-gb1: skipping, looped directory detected
/usr/share/fonts/cmap/adobe-japan1: skipping, looped directory detected
/usr/share/fonts/cmap/adobe-japan2: skipping, looped directory detected
/usr/share/fonts/cmap/adobe-korea1: skipping, looped directory detected
/usr/share/fonts/opentype/cantarell: skipping, looped directory detected
/usr/share/fonts/opentype/ipafont-gothic: skipping, looped directory detected
/usr/share/fonts/opentype/ipafont-mincho: skipping, looped directory detected
/usr/share/fonts/opentype/malayalam: skipping, looped directory detected
/usr/share/fonts/opentype/noto: skipping, looped directory detected
/usr/share/fonts/opentype/urw-base35: skipping, looped directory detected
/usr/share/fonts/truetype/Gargi: skipping, looped directory detected
/usr/share/fonts/truetype/Gubbi: skipping, looped directory detected
/usr/share/fonts/truetype/Nakula: skipping, looped directory detected
/usr/share/fonts/truetype/Navilu: skipping, looped directory detected
/usr/share/fonts/truetype/Sahadeva: skipping, looped directory detected
/usr/share/fonts/truetype/Sarai: skipping, looped directory detected
/usr/share/fonts/truetype/abyssinica: skipping, looped directory detected
/usr/share/fonts/truetype/arphic: skipping, looped directory detected
/usr/share/fonts/truetype/dejavu: skipping, looped directory detected
/usr/share/fonts/truetype/droid: skipping, looped directory detected
/usr/share/fonts/truetype/farsiweb: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-beng-extra: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-deva-extra: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-gujr-extra: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-guru-extra: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-kalapi: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-orya-extra: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-telu-extra: skipping, looped directory detected
/usr/share/fonts/truetype/fonts-yrsa-rasa: skipping, looped directory detected
/usr/share/fonts/truetype/freefont: skipping, looped directory detected
/usr/share/fonts/truetype/kacst: skipping, looped directory detected
/usr/share/fonts/truetype/kacst-one: skipping, looped directory detected
/usr/share/fonts/truetype/lao: skipping, looped directory detected
/usr/share/fonts/truetype/lato: skipping, looped directory detected
/usr/share/fonts/truetype/liberation: skipping, looped directory detected
/usr/share/fonts/truetype/liberation2: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-assamese: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-bengali: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-devanagari: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-gujarati: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-kannada: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-malayalam: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-oriya: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-punjabi: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-tamil: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-tamil-classical: skipping, looped directory detected
/usr/share/fonts/truetype/lohit-telugu: skipping, looped directory detected
/usr/share/fonts/truetype/malayalam: skipping, looped directory detected
/usr/share/fonts/truetype/msttcorefonts: skipping, looped directory detected
/usr/share/fonts/truetype/noto: skipping, looped directory detected
/usr/share/fonts/truetype/openoffice: skipping, looped directory detected
/usr/share/fonts/truetype/padauk: skipping, looped directory detected
/usr/share/fonts/truetype/pagul: skipping, looped directory detected
/usr/share/fonts/truetype/samyak: skipping, looped directory detected
/usr/share/fonts/truetype/samyak-fonts: skipping, looped directory detected
/usr/share/fonts/truetype/scheherazade: skipping, looped directory detected
/usr/share/fonts/truetype/sinhala: skipping, looped directory detected
/usr/share/fonts/truetype/tibetan-machine: skipping, looped directory detected
/usr/share/fonts/truetype/tlwg: skipping, looped directory detected
/usr/share/fonts/truetype/ttf-khmeros-core: skipping, looped directory detected
/usr/share/fonts/truetype/ubuntu: skipping, looped directory detected
/usr/share/fonts/truetype/wqy: skipping, looped directory detected
/usr/share/fonts/truetype/xmind: skipping, looped directory detected
/usr/share/fonts/type1/gsfonts: skipping, looped directory detected
/usr/share/fonts/type1/urw-base35: skipping, looped directory detected
/usr/share/fonts/X11/encodings/large: skipping, looped directory detected
/var/cache/fontconfig: cleaning cache directory
fc-cache: succeeded

More information

$ ls -l /etc/fonts/fonts.conf
-rw-r--r-- 1 root root 2876 Nov 13 14:10 /etc/fonts/fonts.conf

So I had the same issue. Here's how I solved it:

Move fonts to a temp folder

sudo mv /etc/fonts/ /etc/fonts.bak

Reset the desktop:

dconf reset -f /

Reset permissions of existing fonts in shared folder:

find /usr/share/fonts -type f -exec sudo chmod 644 {} ;

Reset permissions of existing fonts in user folder:

find ~/.fonts -type f -exec sudo chmod 644 {} ;

Move fonts back to original folder:

sudo mv /etc/fonts.bak/ /etc/fonts

Reset font cache

sudo fc-cache -r -v

Downside is that by resetting the desktop you will have to start over with any customization you have made there. Also, I'm by no means an expert but the above worked for me so I thought to share it..