He puesto a actualizar la versión y me ha petado la instalación.... el log del magento connect ha sido esto

Checking dependencies of packages
Starting to download Mage_All_Latest-1.9.0.1.tgz ...
...done: 945 bytes
Installing package community/Mage_All_Latest 1.9.0.1
Package community/Mage_All_Latest 1.9.0.1 installed successfully
Starting to download Interface_Adminhtml_Default-1.9.0.0.tgz ...
...done: 1,168,738 bytes
Installing package community/Interface_Adminhtml_Default 1.9.0.0
Package community/Interface_Adminhtml_Default 1.9.0.0 installed successfully
Starting to download Interface_Frontend_Default-1.9.0.0.tgz ...
...done: 747,701 bytes
Installing package community/Interface_Frontend_Default 1.9.0.0
Package community/Interface_Frontend_Default 1.9.0.0 installed successfully
Starting to download Interface_Install_Default-1.9.0.0.tgz ...
...done: 108,327 bytes
Installing package community/Interface_Install_Default 1.9.0.0
Package community/Interface_Install_Default 1.9.0.0 installed successfully
Starting to download Mage_Downloader-1.9.0.1.tgz ...
...done: 281,349 bytes
Installing package community/Mage_Downloader 1.9.0.1
Package community/Mage_Downloader 1.9.0.1 installed successfully
Starting to download Mage_Centinel-1.9.0.1.tgz ...
...done: 38,422 bytes
Installing package community/Mage_Centinel 1.9.0.1
Package community/Mage_Centinel 1.9.0.1 installed successfully
Starting to download Interface_Frontend_Base_Default-1.9.0.0.tgz ...
...done: 397,301 bytes
Installing package community/Interface_Frontend_Base_Default 1.9.0.0
Package community/Interface_Frontend_Base_Default 1.9.0.0 installed successfully
Starting to download Phoenix_Moneybookers-1.3.2.1.tgz ...
...done: 364,315 bytes
Installing package community/Phoenix_Moneybookers 1.3.2.1
Package community/Phoenix_Moneybookers 1.3.2.1 installed successfully
Starting to download Mage_Compiler-1.9.0.1.tgz ...
...done: 10,252 bytes
Installing package community/Mage_Compiler 1.9.0.1
Package community/Mage_Compiler 1.9.0.1 installed successfully
Already installed: community/Magento_Mobile 1.8.0.0.23.2, skipping
Already installed: community/Lib_Cm 1.8.0.0, skipping
Already installed: community/Cm_RedisSession 1.8.0.0, skipping
Starting to download Interface_Frontend_Rwd_Default-1.9.0.1.tgz ...
...done: 852,108 bytes
Installing package community/Interface_Frontend_Rwd_Default 1.9.0.1
Package community/Interface_Frontend_Rwd_Default 1.9.0.1 installed successfully
Starting to download Mage_Core_Adminhtml-1.9.0.0.tgz ...
...done: 528,514 bytes
Installing package community/Mage_Core_Adminhtml 1.9.0.0
Package community/Mage_Core_Adminhtml 1.9.0.0 installed successfully
Starting to download Mage_Core_Modules-1.9.0.1.tgz ...
...done: 3,182,939 bytes
Installing package community/Mage_Core_Modules 1.9.0.1
Package community/Mage_Core_Modules 1.9.0.1 installed successfully
Already installed: community/Lib_Js_Ext 1.7.0.0, skipping
Already installed: community/Lib_LinLibertineFont 2.8.14.1, skipping
Already installed: community/Lib_Js_TinyMCE 3.4.7.1, skipping
Already installed: community/Lib_Varien 1.9.0.0, skipping
Already installed: community/Lib_Google_Checkout 1.8.1.0, skipping
Already installed: community/Lib_Js_Calendar 1.51.1.1, skipping
Already installed: community/Lib_Js_Mage 1.9.0.0, skipping
Already installed: community/Lib_Phpseclib 1.5.0.0, skipping
Already installed: community/Mage_Locale_en_US 1.9.0.0, skipping
Already installed: community/Mage_Locale_de_DE 1.9.0.0, skipping
Already installed: community/Mage_Locale_es_ES 1.9.0.0, skipping
Already installed: community/Mage_Locale_fr_FR 1.9.0.0, skipping
Already installed: community/Mage_Locale_nl_NL 1.9.0.0, skipping
Already installed: community/Mage_Locale_pt_BR 1.9.0.0, skipping
Already installed: community/Mage_Locale_zh_CN 1.9.0.0, skipping
Already installed: community/Lib_Mage 1.8.0.0, skipping
Already installed: community/Lib_Magento 1.9.0.0, skipping
Already installed: community/Lib_Credis 1.8.0.0, skipping
Already installed: community/Lib_ZF 1.12.3.0, skipping
Already installed: community/Lib_Js_Prototype 1.7.0.0.5, skipping
Already installed: community/Lib_ZF_Locale 1.12.3.0, skipping
Package upgraded:
community Mage_All_Latest 1.9.0.1
community Interface_Adminhtml_Default 1.9.0.0
community Interface_Frontend_Default 1.9.0.0
community Interface_Install_Default 1.9.0.0
community Mage_Downloader 1.9.0.1
community Mage_Centinel 1.9.0.1
community Interface_Frontend_Base_Default 1.9.0.0
community Phoenix_Moneybookers 1.3.2.1
community Mage_Compiler 1.9.0.1
community Interface_Frontend_Rwd_Default 1.9.0.1
community Mage_Core_Adminhtml 1.9.0.0
community Mage_Core_Modules 1.9.0.1

Cleaning cache

Exception during cache and session cleaning

He borrado el contenido de carpeta /var/cache/ pero el error que me da es un Internal Server Error se os ocurre que puedo hacer ?

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, postmaster@miservidor.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.

Gracias

Nunca realices upgrades en un entorno de producción. Espero que lo hayas realizado en un entorno de pruebas o que tengas copias de todo.

http://www.magentocommerce.com/knowledge-base/entry/ce18-upgrade-roadmap

Saludos.

Muchas gracias Larry !!!

Al final he pasado el script que pone los permisos al magento y ha sido mano de santo...
Por poco 🙂

Gracias!!!!!!!!!!!!

Magento Community Modules - Spanish (Spain) Language Pack
(Módulos de Magento Community - Paquete de idioma española)
https://github.com/MaWoScha/German_LocalePack_es_ES

First Version for Magento Version 1.9.1.0.
Including new E-Mail-Templates
https://github.com/MaWoScha/German_LocalePack_es_ES/releases/tag/v1.9.1.0.0