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Here is the error hope i can get some help, i show you the update manager and the line of the error, if you need something else just ask for it.

update manager error prompt:

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:Malformed line 58 in source list /etc/apt/sources.list (dist parse), E:The list of sources could not be read., E:The package lists or status file could not be parsed or opened.'

error line:

deb precise-updates main restricted
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sorry it was this one: deb-src partner – Luis Arturo Cabello Rangel Aug 7 '12 at 20:07
conical? do you mean canonical – Mateo Aug 10 '12 at 17:55
possible duplicate of How do I remove a malformed line from my sources.list? – bain May 30 '14 at 19:04

Your URL is mangled:

deb precise-updates main restricted

should be:

deb precise-updates main restricted
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