Closed. This question is not about programming or software development. It is not currently accepting answers. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack Exchange site, you can leave a comment to explain where the question may be able to be answered. Closed 3 hours ago. Improve this question I have/had a Wordpress site on an Ubuntu server, but after upgrading the OS from 20.04 LTS to 22.04 LTS, the site is no longer connected with the site MySQL database. I made no changes to WordPress settings, but the upgrade updated MySQL (now 8.0.39-0ubuntu0.22.04.1) and PHP (now 8.1). Navigating to the site URL displays a Wordpress 'Hello World' page and no errors. Looking at the contents of /var/lib/mysql, I have a 36mb ibdata1 file, and in the database subfolder named "wordpress", the 12 wp_*.ibd files I would expect. Each is between 130k and 212k, so it seems likely they hold data. The config is set to use per-table files. Logging in to MySQL with the former account (still there) I see all tables, mysql> show tables; +-----------------------+ | Tables_in_wordpress | +-----------------------+ | README | | wp_commentmeta | | wp_comments | | wp_links | | wp_options | | wp_postmeta | | wp_posts | | wp_term_relationships | | wp_term_taxonomy | | wp_termmeta | | wp_terms | | wp_usermeta | | wp_users | +-----------------------+ There is only one Wordpress user (admin), and only the 3 'starter' posts. There should be a couple of users and dozens of posts. So the existing data is now somehow disconnected to the site. I have no .sql backup (my bad). Is there a way I can recover data from the .idb files, or ibdata1?