I've already solved, thank you
 
> Date: Tue, 21 Dec 2010 17:06:23 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: Re: [Bug 659438] Re: Installation/Removal fails because of package which could not be located (faiulre in apt.Cache.required_download)
> 
> Hello All,
> 
> I had the same issue which I have resolved by updating atpdaemon with the
> synaptic package manager.
> It works now.
> 
> JF
> 
> On Mon, Dec 20, 2010 at 9:13 PM, Paul Goosen
> <email address hidden>wrote:
> 
> > Hi Martin
> >
> > I am very new to Ubuntu, still need to learn a lot.
> >
> > What I did to solve my problem was to do an update with Update Manager
> > and once that was done the concern was resolved.
> >
> > I then ran Ubuntu Software Center and was able to install programs as
> > per normal.
> >
> > Thanks for your assistance.
> >
> > Regards
> > Paul
> >
> > --
> > You received this bug notification because you are a direct subscriber
> > of a duplicate bug (676655).
> > https://bugs.launchpad.net/bugs/659438
> >
> > Title:
> > Installation/Removal fails because of package which could not be located
> > (faiulre in apt.Cache.required_download)
> >
> > Status in Aptdaemon:
> > Confirmed
> > Status in “aptdaemon” package in Ubuntu:
> > Fix Committed
> > Status in “python-apt” package in Ubuntu:
> > New
> > Status in “aptdaemon” source package in Maverick:
> > Fix Committed
> > Status in “python-apt” source package in Maverick:
> > New
> >
> > Bug description:
> > Traceback (most recent call last):
> > File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in
> > simulate
> > return self._simulate_helper(trans, status_path)
> > File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 936, in
> > _simulate_helper
> > return depends, status, self._cache.required_download, \
> > File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 218, in
> > required_download
> > pm.get_archives(fetcher, self._list, self._records)
> > SystemError: E:I wasn't able to locate file for the liblua50 package. This
> > might mean you need to manually fix this package.
> >
> > To unsubscribe from this bug, go to:
> > https://bugs.launchpad.net/aptdaemon/+bug/659438/+subscribe
> >
> 
> -- 
> You received this bug notification because you are a direct subscriber
> of a duplicate bug (691064).
> https://bugs.launchpad.net/bugs/659438
> 
> Title:
> Installation/Removal fails because of package which could not be located (faiulre in apt.Cache.required_download)
> 
> Status in Aptdaemon:
> Confirmed
> Status in “aptdaemon” package in Ubuntu:
> Fix Committed
> Status in “python-apt” package in Ubuntu:
> New
> Status in “aptdaemon” source package in Maverick:
> Fix Committed
> Status in “python-apt” source package in Maverick:
> New
> 
> Bug description:
> Traceback (most recent call last):
> File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in simulate
> return self._simulate_helper(trans, status_path)
> File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 936, in _simulate_helper
> return depends, status, self._cache.required_download, \
> File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 218, in required_download
> pm.get_archives(fetcher, self._list, self._records)
> SystemError: E:I wasn't able to locate file for the liblua50 package. This might mean you need to manually fix this package.
> 
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/aptdaemon/+bug/659438/+subscribe