Onepage and Blog in the same website

Did you check this page for possible solutions? learn.getgrav.org/troubleshooting/page-not-found

Not yet, Will do. Thanks.

OK. Checked all the solutions in the page not found troubleshooting section.

1. Missing .htaccess file:
   File is present in the root of the site (Apache DocumentRoot parameter) and has 775 access rights for user www-data, group www-data.

2. AllowOverride All:
   As I have no <Directory> section in the <VirtualHost:80> section, I cannot add AllowOverride All.

3. RewriteBase:
   I already tried with 'RewriteBase /' enabled (grav is in the root of the virtualhost directiory).

4. Missing rewrite modules:
   Already enabled them at install time. Checked again with a2enmod.

5. Grav Error 404 Page:
   I am not getting that page.

6. 404 Page not found on nginx:
   I am running Apache.

Bottom line: the solutions presented in that troubleshooting section, don't work.
Anything else I can try?

Update:
There was a <Directory /var/www> entry in the default /etc/apache2/apached.conf with an AllowOverride None entry. Changed it to AllowOverride All. Now the Blog section works as far as preliminary tests show.