[Bug 1003387] [NEW] update manager crashes saying"cannot initialize package information

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i am using ubuntu 12.04LTS(precise pangolin) in my desktop of hardware:
RAM:1.8 GB
processor:Pentium(R) Dual-core CPU E5500@ 2.80GHz
when opening update manager an error messsage is popping titled 'cannot initialize package information' and an error message  showing beneath it as below:
'E:Opening /etc/apt/sources.list.d/private-ppa.launchpad.net_commercial-ppa-uploaders_fullcircle-issue-60_ubuntu.list - ifstream::ifstream (13: Permission denied)'
my ubuntu software center also got the problem it open ups and closes quickly as it opens,
as in the error message i also got two issues of full circle magazine issue 59&60,as i seen the error message i removed both using synaptic package manager but still the problem persists

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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update manager crashes saying"cannot initialize package information
https://bugs.launchpad.net/bugs/1003387
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