I'm gettng the same error:
Operating System: Ubuntu Linux 14.04.3 LTS (rev. 52, hvm)
I set up an aws lampstack using bitnami hosting. Everything was running fine until I tried installing letsencrypt ssl certificate. I did not manage to set it up but during its set up my server stopped working. Now I managed to run my server again but the issue is that the server is not pointing to my previous public(www) folder. It is pointing to some other folder and it says: 'Apache2 Ubuntu Default Page'.
My previous root was /opt/bitnami/apache2/htdocs but now I'm not sure where its pointing
I cannot access my phpmyadmin. All my important data is in there. This gives me a 404: http://127.0.0.1:8888/phpmyadmin
During this I also removed nginx, I'm not sure if I was supposed to do that.