HEIC Viewing

Install the following package, and Ubuntu's default Image Viewer will start working.

Refer: https://askubuntu.com/questions/958355/any-app-on-ubuntu-to-open-and-or-convert-heif-pictures-heic-high-efficiency-i

sudo apt install heif-gdk-pixbuf

Install this to allow Nautlius to create thumbnails

Refer: http://manpages.ubuntu.com/manpages/impish/man1/heif-thumbnailer.1.html

sudo apt install heif-thumbnailer