NOTE:

• Redshift config isn't read from .config directory due to some AppArmor settings in Debian, see: jonls/redshift#820

This could help until it gets fixed upstream:

Edit the file /etc/apparmor.d/usr.bin.redshift and change the line

owner @{HOME}/.config/redshift.conf r,

To

owner @{HOME}/.config/redshift/* r,