I just upgraded ubuntu 18.04 to 20.04 with cinnamon desktop environment. Then, it seems that fonts do not display properly in applets. Basically, I just see white boxes instead of letters, as in the attatched image. For example, I tried using different fonts for my desktop and re-installing cinnamon desktop environment, but this font problem did not get resolved. How could I fix this font problem?
You could try to reset your cinnamon settings:
To backup -
from a terminal, run:
dconf dump /org/cinnamon/ > backup_of_my_cinnamon_settings
backup_of_my_cinnamon_settings file somewhere for later.
To reset to defaults:
dconf reset -f /org/cinnamon/
To restore all your settings:
dconf load /org/cinnamon/ < backup_of_my_cinnamon_settings