This article provides a solution for the issue where you receive an error message saying that the requested URL was not found on this server.
The requested URL /magento2index.php/admin/admin/dashboard/index/key/0c81957145a968b697c32a846598dc2e/ was not found on this server.
Note the lack of a slash character between
index.php in the URL.
The base URL is not correct. The base URL must:
web/unsecure/base_urlrecord in the
Re-run the installation using a valid value.