Hello and welcome,
could you please provide the content of tutorialDocker.conf and the way you’ve started the container?
As apache is not part of the default-ubuntu-image the mentioned error-message is normal - you have to install it using apt-get update && apt-get install apache2 or use an image which is specialized for providing the apache-service (as you did using the httpd-image).
I would prefer the way using the httpd-image as it should be smaller and provide less additional and not needed software (which is good for security-reason).
Best regards
Matthias