Overview

When I migrated from Drupal 6 to Drupal 7, I got the following error message:

Notice: Undefined index: distribution_name in drupal_install_profile_distribution_name()

To reproduce the issue

1. Open admin/modules.
2. At admin/reports/, open the Recent log messages, it will show the following notice: Notice: Undefined index: distribution_name in drupal_install_profile_distribution_name() (line 207 of ...).

To solve

Adapt the table name if you use prefix and then execute the following SQL statement:

UPDATE `system` 
SET `status` = '1' 
WHERE `filename` = 'profiles/standard/standard.profile';