OP respondeu em um comentário
% bl0ck_qu0te%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 'n.' is not known on line 3 in source list /etc/apt/sources.list.d/pmcenery-ppa-oneiric.list, E:The list of sources could not be read., E:The package lists or status file could not be parsed or opened.'