Disk Activity not working in Spotlight on UNIX
<h1>Component: Most Active Disk</h1>
sh: 0: not found
<b>Source:</b> "LogicalDisks" table
<b>Time:</b> 04/10/2011 10:35:24 a.m.
The problem was effectively permission of write and execute. Apparently when you install Ubuntu it does not install an original shell sh, but install a Debian shell called DashAsBinSh
To correct the problem run the following command at ubuntu distributions dpkg-reconfigure dashand then select NO
After, close the Spotlight and runs back and READY.