I have a Drupal 7 site with a half-dozen multisites/subsites and I am trying to setup Drush so that I can run my modules updates from the command line for the subsites. Running Drush for the main site works fine. Running Drush for ONE of the sub sites works fine. However for about 5 of the subsites I can run commands like
drush @subsite status
drush @subsite updb
but if I try to run
drush @subsite update
drush @subsite ups
I get an error:
Command pm-updatestatus needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.
So I don't understand what makes all the other sites different from the one, or why some commands would work and others not. I am running these commands from my main Drupal install path:
What am I doing wrong, and how can I get update to work for my subsites?
It's worth noting that the majority of these subsites were setup at a time when I didn't necessarily know what I was doing, so I can only describe their configuration as "wacky". One of the affected sites is setup in a fairly standard way and the working subsite is of the "wacky" variety, however, so I don't expect that's the problem.
EDIT: Because it is working for one site and not others, I'm wondering if it's a file permission issue. What user does Drush run as, and what level of access does it needs to which files? In my case, I am working on Ubuntu.