Update / cleanup installer error message
Update / cleanup installer error message

Closes: #1756
Updating since we landed #788 and have shipped Apache support almost
everywhere

jsha/letsencrypt,jtl999/certbot,stweil/letsencrypt,jsha/letsencrypt,letsencrypt/letsencrypt,bsmr-misc-forks/letsencrypt,lmcro/letsencrypt,letsencrypt/letsencrypt,bsmr-misc-forks/letsencrypt,jtl999/certbot,stweil/letsencrypt,lmcro/letsencrypt