First, as the profile may have previously been disabled, re-enable the disabled profile by removing the symbolic link to the profile in /etc/apparmor.d/disable/.
sudo rm /etc/apparmor.d/disable/profile.name
Then load the profile using the -a option.
cat /etc/apparmor.d/profile.name | sudo apparmor_parser -a
The /etc/apparmor.d/disable directory can be used along with the apparmor_parser -R option to disable a profile.
sudo ln -s /etc/apparmor.d/profile.name /etc/apparmor.d/disable/ sudo apparmor_parser -R /etc/apparmor.d/profile.name