Accessing and converting iPhone photos on Linux

Instructions are for Debian or derivatives.

One-Time Setup

Install FUSE module for iPhone and converter for HEIC images:

sudo apt install ifuse libheif-examples

Create a new directory that will be used as the mount point for iPhone. Mine is in the home directory:

mkdir $HOME/iphone

Connect the iPhone to the Linux machine, click "Trust" on iPhone.
On Linux machine, run:

ifuse $HOME/iphone

Copy images from $HOME/iphone/DCIM onto your machine.

To convert HEIC images to JPEG, run this snippet in the directory with images:

for f in *.HEIC; do heif-convert -q 100 $f $f.jpg; done