Certainly,
http://docs.moodle.org/26/en/Step-by-step_Installation_Guide_for_Ubuntu
"Step 1: Install Ubuntu 12.04LTS - Server Edition amd64 Preferred
http://www.ubuntu.com/download
If you are reading this after April 2014 then USE Ubuntu Server 14.04LTS amd64 which will have the required packages for upgrading to Moodle 2.7"
I did see the recommendation for APC but it seems like OPCache is
"Suggestions: Install APC/Change Document Root
- Ignore this if you installed Ubuntu Server 14.04LTS then you can use the built-in PHP OPcache, http://docs.moodle.org/26/en/OPcache
Highly suggest that you install a PHP Accelerator, We will use APC for this install."
However, OPCache seems to be recomended by the developers -
"NOTE: If you are running PHP 5.3 or 5.4 you can safely ignore the Environment Check message about OpCache. Nonetheless, it might be useful to upgrade Operating System/PHP and get to 5.5 or newer; as there have been all sorts of problems described on PHP 5.2 and 5.3, and upgrading PHP turned out to be the easier solution."
Hence my question about moving from my 12.04 install up to 13.10 and if anyone has it stably on 2.6.1, which would not only get me a newer PHP version with OPCache but also better position me for 2.7.
It sounds like as long as a keep an image of the system prior to OS upgrade, it should provide me with a stable platform when I'm done.
Thank you for the advice anyone else running Ubuntu 13 with 2.6.1?