I have installed two Drupal sites in my local Ubuntu desktop 15.10 Apache2 (2.4.12) environment: One is a fresh install of Drupal 8 and The second is a copy of an existing working site built with Drupal 7 (which is mostly core-modules based, very humble by means of pages). Both sites are working fine without any problem, anywhere.
My aim is first and foremost upgrading the Drupal 7 site to Drupal 8. I did all the preliminary stages like configuring the same languages, Keep minimal by means of modules (uninstalling any modules in the D7 site that I could easily bring back after the Upgrade), making sure the same modules are installed in both sites, etc, and now I just want to "Transcend" (hope its a good phrasing) my Drupal 7 site into the fresh Drupal 8 one.
To achieve my aim I've installed the Drupal Upgrade module in my Drupal 8 site, went to localhost/sitename/upgrade, and filled in all the details of the Drupal 7 site.
When I clicked the "Review upgrade" button I got the error:
Source database does not contain a recognizable Drupal version.
I've googled this error as an exact phrase ("Error") and found very few results; Most of them seem to me to require a PHP programming knowledge that I've yet acquired, so I can't determine if the error is due to a bug (especially since this module is still under heavy development) or due to my mistake in understanding the concept\functionality of this module.
What reasons are there that the D8 Drupal upgrade module wont "like" the D7 database I provided? Especially while the Drupal 7 site is working fine both online and locally.
Would migrating be a decent alternative for upgrading, if upgrading isn't possible for whatever reason? If so, what is the best most simple solution You could think of for migration?
I went to /var/www/html/benia/modules/migrate_upgrade/src/MigrationCreationTrait.php and did:
-- return $version_string ? substr($version_string, 0, 1) : FALSE; ++ return 7; ++ return $version_string ? substr($version_string, 0, 1) : FALSE;
Than got this error in top of the screen.