'civicrm_extension' doesn't exist on upgrade from 4.1.6 to 4.3.5

[CiviTeacher.com]

Similar to this experience: http://forum.civicrm.org/index.php/topic,25555.0.html 

I have turned off civitheme already all other related CiviCRM modules.

Civi's still trying to run the query on civicrm_extensions that doesn't yet exist, and error-ing out before the upgrade begins.

I worked around by commenting out the public static function &getExtensions() in CRM/Core/PseudoConstant.php, then un-commenting it after the upgrade completed successfully.

[Walter.Ego]

Sorry... I have the same problem.
Can you explain me how I can resolve it?

Thanks

[btc97]

Thanks for posting this fix @CiviTeacher.com!

If something can go wrong with a CiviCRM upgrade, it will... Not sure why this happened on this particular upgrade, but it did.