Drupal 8.x

-I installed Ubuntu 18.04.3 LTS
-I installed LAMP:
1) installed apache2 first
2) then installed the mySQL database
3) then installed php 7.3 and some additional packages
-I download Drupal8 from the official site.
-In the terminal, I set permissions so that you can create files through the terminal and copy folders in the: var / www / html 
-I Copy the folder with drupal8 to the: var / www / html 
In the browser I wrote the path and the installation window appeared, but then I got errors:

 -I installed Ubuntu 18.04.3 LTS
-I installed LAMP:
1) installed apache2 first
2) then installed the mySQL database
3) then installed php 7.3 and some additional packages
-I download Drupal8 from the official site.
-In the terminal, I set permissions so that you can create files through the terminal and copy folders in the: var / www / html 
-I Copy the folder with drupal8 to the: var / www / html 
In the browser I wrote the path and the installation window appeared, but then I got errors:

Requirements problem
Errors found

Hello all,

I'm developing small things for Drupal 8.8 based sites. For that, I use a local Drupal installation (made with Acquia desktop) and I have two remote testing sites and two production sites. In fact, the dev I'm doing is for both of them. The dev requires to add some content, like articles and menus. The uuid of any of the five Drupal installation described above are all different but they all share the same Drupal core version (8.8.1).

I am following this Lullabot post about building a text filter: https://www.lullabot.com/articles/creating-a-custom-filter-in-drupal-8

I have created the celebrate.info.yml file in the main folder for the Celebrate module /modules/celebrate/celebrate.info.yml

I have created the FilterCelebrate.php at in the nested folder: /modules/celebrate/src/Plugin/Filter/FilterCelebrate.php