CSS and JS directories from /web/sites/default/files
I created manually these directories, but on activating admin/config/development/performance "Aggregate CSS files" and "Aggregate JavaScript files " the directories are deleted again.
If I deactivate "Bandwidth optimization" (CSS and JS) all is fine but after activation all is broken because the CSS and JS directories are not created and the CSS and js files are missing.
Following the instructions from here, I'm trying to upgrade my Drupal 7 site to Drupal 9. It went reasonably smooth, but now I'm confused:In the upgrade review I see that
52 Modules will not be upgraded
Following the instructions, I installed and activated a large part of those 52 modules, so I'd have expected that those modules would be available for the upgrade. For example the report lists: