Comment 9 for bug 1948752

To unload and temporarily disable the redshift profile until reboot (well technically its only until policy is reloaded and then redshift restarted)

  sudo apparmor_parser -R etc/apparmor.d/usr.bin.redshift

To persistently disable just the redshift profile,

  sudo aa-disable /etc/apparmor.d/usr.bin.redshift

To temporarily disable apparmor entirely add
  apparmor=0

to the kernel boot parameters.

To permanently disable apparmor add
  apparmor=0

to /etc/defaults/grub and then run
  sudo update-grub