This matter is now resolved.
The reply by Plotec gave me a clue as to what I needed to do.
I tried using the Ubuntu terminal (CLI) for my server, went to the root directory, and used the Shopware console (bin/console).
I went to the root directory (e.g. /var/www/shopware) then typed the following commands:
- sudo php bin/console theme:compile
- sudo php bin/console theme:refresh
- sudo php bin/console theme:change
In the “change theme” menu, I select my one and only storefront, and select the default theme. I refreshed my page afterwards, and the Home Page loads as intended.
I hope my little setback can help someone experiencing something similar in the future