Custom drupal module does not appear on the extend page
There was a preceding issue with installation, I had several drupal projects under Projects folder, the newer project tried to access modules in the directory of the older one. Probably, the paths have somehow mixed, leading to the problems with modules installation and database connection(it was not described in a settings.php file). After the disabling of the previous projects and reinstallation of the current one, everything has been working properly.