Upgrading Drupal

I am trying to get rid of unused modules to update to D9. I also continually fight " [error]   (Currently using Incompatible modules Array)"

So far, my module array is consistent, but it seems that can change too easily.

My problem is that I have modules that I installed that are in modules/contrib and in composer.json, but which do not appear in web/admin/modules.

And I have the opposite problem too. I have modules that are not in modules/contrib or composer.json, but which do appear in web/admin/modules

I have a, as far as I can tell, Drupal 5.5 installation, which I need to upgrade to 8.8.5 (originally put 8.3 by mistake), and eventually beyond.

The issue is that the system was setup by someone who has left the company many years age, and left no documentation.

I am trying to update from D8.9.3 to D9.0.3. I went through all my modules (too many) to be sure they were ready for D9. then I updates following https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-8-to-....

but when I try to update the database,  I get

I tried different ways to migrate Drupal 7 to 8, There are lot of errors at different levels. Not sure what is the correct way to go forward. 

While migrating using UI, most of the modules are not supported by 8. I need alternate modules so i can run my system.

As per instructions:

- Installed Migrate Tools
- Installed Migrate Upgrade
- Installed Migrate Plus
- Installed Commerce Migrate and Commerce Migrate Commerce
- Prepared a fresh copy of Drupal 8 site with all required module enabled

Can someone help me understand how or what is the best approach for upgrading a drupal site from 8.7.x to 8.9.x / 9.x. (Community recommended to upgrade to 8.9.x first and then to 9.x)

How can a non profit organisation plan the frequent upgrades coming up?

We have about 50 contrib modules to be updated, Also to upgrade to 9.x, 40% of existing contrib modules are not available.

Hey,

I am on Drupal 7.72 and my Drupal instance is behind a HTTP proxy, so have I defined the proxy variables

$conf['proxy_server'] = 'firewall.mydomain';
$conf['proxy_port'] = 8080;

in sites/default/settings.php.

Fetching update info works, but installing the updates from Home » Administration » Reports » Available updates fails with error:

   HTTP error 301 occurred when trying to fetch https://ftp.drupal.org/files/projects/ckeditor-7.x-1.19.tar.gz.