I got an error when installing 2.0.16, error is in postUpdateCmd. No User plugin was installed and obviously, the following migration fails. I tried the migration on two different environments (development on Mac with MySQL, stage on Linux with Postgres), same error on both.

> php artisan october:install
....
> System\Console\ComposerScript::postUpdateCmd

In Plugin.php line 87:

  Class 'RainLab\User\Models\User' not found  

In Plugin.php line 87:

  Class 'RainLab\User\Models\User' not found  

.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.
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    ,%&\%&&%&&%,@@@\@@@/@@@88\88888/88'    
    %&&%&%&/%&&%@@\@@/ /@@@88888\88888'    
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        |o|        | |         | |         
        |.|        | |         | |         
`========= INSTALLATION COMPLETE ========='

Hello,

It looks like you may be missing the RainLab.User plugin, please run php artisan plugin:check to make sure all dependencies are installed.

I hope this helps!

The check says what's known:

php artisan plugin:check

In Plugin.php line 87:

  Class 'RainLab\User\Models\User' not found  

In the guide it stands:

If you have any non-vendor plugins that you have developed yourself, copy them across as well.

Nothing about vendor plugins. Yes, one of my plugins is actually dependent on Rainlab.User and I expected Rainlab.User to be installed automatically because in my Company\MyPlugin\Plugin.php it says

public $require = ['RainLab.User'];

Do I have to install the User plugin manually before I start the installation or at least do I have to edit the composer.json dependencies by hand?

Yes. Install with composer:

composer require rainlab/user-plugin

Should do the trick.

OK, I managed it somehow. I did not copy our plugins to the new installation at the beginning of the migration. I did the migration, then copied our plugins and did the plugin sync.

October 2.0 works, but I don't see any way how to migrate the data from the database, which is understandable because the migration process has no information about the original database. Obviously, we have to re-enter all backend users, mail templates and many, many other settings manually. All this on developer, stage and production servers. I don't see any benefits of migration for existing installations that just work. However, I assume that no bugs will be backported to version 1.0.x, so there is probably no alternative. It can be a pretty expensive migration.