Generally the link is https://download.opensuse.org/repositories/graphics:/darktable/
signing key
the signing key fingerprint can be found here
RPM version
openSUSE
zypper ar obs://graphics:darktable obs-graphics:darktable
zypper ref
zypper in --from obs-graphics:darktable darktable
Fedora
curl -o /etc/yum.repos.d/obs-graphics:darktable.repo https://download.opensuse.org/repositories/graphics:/darktable/Fedora_<fedora version>/graphics:darktable.repo
rpm --import https://download.opensuse.org/repositories/graphics:/darktable/Fedora_<fedora version>/repodata/repomd.xml.key
dnf update
dnf install darktable
deb based distros
<deb repo> is either:
- xUbuntu_<version>
- Debian_<version>
echo 'deb http://download.opensuse.org/repositories/graphics:/darktable/<deb repo>' | sudo tee /etc/apt/sources.list.d/graphics:darktable.list
curl -fsSL https://download.opensuse.org/repositories/graphics:darktable/<deb repo>/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/graphics_darktable.gpg > /dev/null
sudo apt update
sudo apt install darktable