blog.crox.net

Add this line to /etc/apt/sources.list:

deb http://deb.debian.org/debian bookworm-backports main

Run:

# apt-get update
# apt install -t bookworm-backports libheif1

This solves the issues encountered when decoding HEIF (.heic) files produced by iPhone / iOS 18, causing for instance rendering in Nextcloud to fail.

This page has more details on using Backports.

Since Apple moved from JPEG to HEIF as default format about two years ago, there has been a lot of progress.

There is a very straightforward way to add minimal HEIC/HEIF support to Ubuntu:

sudo add-apt-repository ppa:strukturag/libheif
sudo apt-get install heif-gdk-pixbuf heif-gimp-plugin heif-thumbnailer

That's it! You don't even need to logout or restart, the new functionality is available immediately.

More details here and here.