fix "Waiting for other installations to complete." on OSX 10.6 10.7

reset.sh

## fix "Waiting for other installations to complete." on OSX 10.6 10.7
## sometimes a failed installation leaves us unable to 
## perform an installation. The following fixes it for me
sudo rm /private/var/db/mds/system/mds.install.lock
sudo reboot

This worked for me. Thanks! I love nerds <3

worked for me! Thanks.. lol

This seems a bit extreme...first you should check whether there are actually other installers waiting to finish, and do whatever they need.

In my case, I started installing new software while there was a popup saying that I needed to close iTunes for an install to finish (due to a recent update). Switching users and closing iTunes, which was open on my other user account, let the first install finish, which in turn let my second install finish as well.

I agree with @TheodoreMurdock - in my case, I forgot that there was an xcode installation going in the background. Being patient let everything finish gracefully :) . patience

Just:
sudo killall -1 installd