Thumbnails at people tab missing after database restore

[Carlos Alberto Santos]

Hello All, Recentlly I formated my computer, before I made a backup of digikam database, I use Linux Ubuntu and MySQL. I restored the database after reinstall Ubutu, but all Thumbnails at "People" tab are missing. In the tab "Tags" is showing the Thumbnails, and I already set the option "Mark as face tag". Any help about?