Notice: Undefined index: aloha in system_list() (line 194 of core/includes/module.inc).

The root cause of the problem appears to be nearby some code that iterates through a list of all the modules in an associative array/hash and uses each module name from this to index a second list of modules which has the 4 modules mentioned missing. The 4 modules are apparently disabled but examining the modules page shows that they are enabled after the install is complete.

The next step would be to dig deeper into the Drupal code to see how it decided that the 4 modules were absent from the 2nd list because they were disabled. What code, config (and where) determines whether a module is disable or enabled?

I looked at this at the Drupal London monthly drop-in code sprint today: https://plus.google.com/107588087296697005765/posts/5VZnA693nMP

I believe this is fixed in the latest dev release, as a side consequence of upgrading core. Or at least I'm not seeing any errors on installation.

Thanks webchick - I will re-download the dev and see. It would be good for my learning to do a diff to see how the changes would have fixed this as a side consequence.

I would love to tell you that, but I honestly have no idea. :) When I updated core to the latest version, the error magically stopped happening. Hooray? :)

webchick, ha ha yes indeed I would agree that is Hooray, yes, thanks! I meant that I'm learning about the code so would be happy to do the diff myself, with Beyond Compare to see what was changed. All good for my learning. Thanks again for letting me know that the problem is fixed in the dev! Cheers!