When I start the Update Manager it shows me this 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:Type '/tualatrix/ppa/ubuntu' is not known on line 3 in source list /etc/apt/sources.list.d/tualatrix-ppa-natty.list"
How can I solve this problem?