update manager crashes saying"cannot initialize package information

[samuel gregory kurian]

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

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1003387/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Chelmite (steve-kelem)]

I'm getting the message:

Could not initialize the package information

An unresolvable problem occurred while initializing the package information.

Please report this bug against the 'update-manager' package and include the following error message:

'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'