I can’t install Hippo CMS on Ubunt 18.04

I follow the instructions https://www.onehippo.org/trails/getting-started/hippo-essentials-getting-started.html. but the http: // localhost: 8080 / essentials and http: // localhost: 8080 / site links do not work for me. The remaining 2 links work.

Are there any errors on startup? What are you seeing when you approach the above links?