Hi there,
Belive me, I´ve read many posts about this problem, and tried many things, before deciding to open this one.
This is the issue:
1. I upgrade my D6 site and all it´s contrib modules to latest D6 versions.
2. I disable all contrib modules.
3. I try to upgrade to D7, the same way I usually upgrade (deleting old core files and adding the new ones).
4. After upgrading everything, and run the update.php script, I encounter that all my admin pages show a message “You do not have any administrative items”. I´ve read several posts about this error, and decide to run the update script again, because it probably didn´t finished.
5. That was true, I´ve had 14 updates pending. So after running the script again, this error appears:
Update #7061: Failed: DatabaseSchemaObjectExistsException: Table <em class="placeholder">system_update_7061</em> already exists. in DatabaseSchema->createTable() (line 657 of /home/public_html/includes/database/schema.inc).
So after reading that this is some sort of a Drupal unresolved bug, I delete that table (system_update_7061), so it can create it again.
6. I run the update script again and found a new error: