Hi,
This problem was caused (as described) by interruption in running dpkg command. 
dpkg is launched whenever something is done with packages: installing, 
uninstalling, reconfiguring. Most likely Synaptic was interrupted, and dpkg 
couldn't finish configuring newly installed packages.
As a result dpkg cache is inconsistent and you see  "E:_cache->open()" problem. 
To fix this problem you should simply run "sudo dpkg --configure -a" and 
provide your password. After that you will be able to use synaptic for managing 
your software again. 
I'm changing the status of this bug to "invalid" as this is not really bug, but 
local problem.

** Changed in: ubuntu
     Assignee: (unassigned) => Tomasz Z. Napierala (tzn)
       Status: New => Invalid

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When trying to install a program, I recieve 'must run 'dpkg --configure -a' but 
I'm told that I need superuser privelages
https://bugs.launchpad.net/bugs/288444
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