Upgrading Drupal

I get the following error when upgrading the database via the /update.php page.

I managed to update everything in composer, I am just stuck to it at this point.

We currently have around 10 Drupal sites hosted on one server all running Drupal 7. They all share a common database for user management. I went to try and upgrade one of the sites to a new Drupal 8 setup, but it appears to be failing. I believe the issue is in the shared database. When I try to run the upgrade without a prefix, Drupal says it cannot find a valid installation. If I add the "dbi_deafult." prefix, the upgrade runs and it appears to find all the modules, BUT it does not import any of the site specific data, thus no content or styling.

Hello,

I have a large Drupal 7 system that I built and maintain as my primary job.  Dozens of content types, many custom modules and a couple hundred thousand nodes.  The system is used by a couple thousand staff members of a regional school district.  I'm now faced with the looming challenge of needing to upgrade to Drupal 9.  I have begun this endeavor several times before and have found it to be an Everest challenge and have put the task aside in hopes that maybe I'll die before I have to do it which would save me a lot of stress.....

According to admin web interface an update to 8.9.18 is needed.

But when I ask composer list the available updates, I can only see 8.9.16

We are in the process of migrating from Drupal 6 to Drupal 9. (I know. It was like this when I started here last December.) We have the new site stood up and are working on building it out. I have a local vanilla Drupal9 instance where I have used the standard Drupal Migration tool to convert the old data. I appear to have all the users, roles, content types and content in this local instance. I am trying to migrate the users and content from this local D9 instance into the new site. Have tried a few backup/restore strategies and have wound up blowing up the new site.

Hi All,

So, here's the thing. My hosting company decided to migrate my old server to a new server. This completely broke the site so if you visit it you get an error. That's it.