Upgrade 8.5.9 to 9.1.2 fails

Installation
1

Hi,
I uninstalled all extra extensions to make sure the upgrade runs through. Unfortunately it does not.

I tried to replace the /concrete directory and after this failed (and I restored the original filesystem without extensions and DB) I tried the internal upgrading process:
Both ways show up kind of the same error message: Sooner or later some column is missing from an SQL statement.
Also: The internal process shows up a “bad gateway” error on the server. Refreshing that page does not change anything (bad gateway again). Afterwards the missing column error occurs.
Currently I restored the original fileset and DB (without extensions) so I do not have the exact message to post here.

All ConcreteCMS caching is currently off.
PHP 7.4.30 and MySQL version: 8.0.20 are installed.
PHP memory limit: 512 MB,
PHP max execution time: 30s

Olaf

2

When I try to upgrade 8.4.3 to 9.1.2 I get:

An exception occurred while executing 'SELECT t0.siteID AS siteID_1, t0.pThemeID AS pThemeID_2, t0.pThemeSkinIdentifier AS pThemeSkinIdentifier_3, t0.siteIsDefault AS siteIsD  
  efault_4, t0.siteHandle AS siteHandle_5, t0.siteTypeID AS siteTypeID_6 FROM Sites t0':                                                                                          
                                                                                                                                                                                  
  SQLSTATE[42S22]: Column not found: 1054 Unknown column 't0.pThemeSkinIdentifier' in 'field list'
3

Adding that pThemeSkinIdentifier column to the database doesn’t seem to help, it still can’t find it.

4

Same problem here (but not the only one)
The problem is that the migration script skip the pThemeSkinIdentifier field before the " ```
An exception occurred while executing 'SELECT t0.siteID AS siteID_1…" part comes.

5

The recommended process is to update to latest 8.5.12 then update to 9.1.3. Have you tried with that intermediate update step?