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upgrade from 1.9.1.0 fails

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upgrade from 1.9.1.0 fails

I'm trying to upgrade community edition 1.9.1.0 in response to the latest security alert. In Magento Connect Manager I search for update, then choose Mage_All_Latest upgrade to 1.9.1.1 and commit. Everything seems to be fine until I get an error telling me ./lib/Varien/Cache cannot be deleted and I should check permissions. these are 660. and in the apache error log I have: PHP Fatal error: Class 'Varien_Cache_Core' not found in /var/www/html/beadstore19/lib/Zend/Cache.php on line 195. The site is screwed and has to be restored. If I try to choose the upgrade to 1.9.2.0 instead (latest and greatest) after the install I get the installation screen telling me I will now download the latest updates, but this always fails and the site is totally screwed. OK, let's look at the first problem. Anyone any ideas?