In order to install MS True Type fonts in Ubuntu you have to install the ttf-mscorefonts-installer package:
sudo apt-get install ttf-mscorefonts-installer
After installing the package regenerate the font cache:
sudo fc-cache -fv
Now you can use a bunch of MS True Type fonts in Ubuntu.
Segoe UI font, however, is not part of the ttf-mscorerfonts package, so you have to search and get a segoe-ui.ttf for yourself. (either by extracting it from a windows ISO or installation or by searching through the internet, i guess it should not be too hard to find one...)
When you have our segoe-ui.ttf file, copy it in a foldr called ~/.fonts. If no such folder exists, create it, no problem.
Now again regenerate the font cache: sudo fc-cache -fv, and voilá. Now you are able to use Segoe UI font on ubuntu.
►◄▲▼correctly. And restarting Brave lets me see them correctly here in the browser too. – Ryan Feb 11 '24 at 21:05