I have the same problem when trying to install a Brother printer. I get the same error message as #4.
In my sources.list I have the following line: deb http://www.openprinting.org/download/printdriver/debian/ lsb3.2 main
However in the error message it refers to: deb http://www.openprinting.org/download/printdriver/debian/ lsb3.1 gutenprint
Maybe this has something to do with it.
I have the same problem when trying to install a Brother printer. I get the same error message as #4.
In my sources.list I have the following line: www.openprintin g.org/download/ printdriver/ debian/ lsb3.2 main
deb http://
However in the error message it refers to: www.openprintin g.org/download/ printdriver/ debian/ lsb3.1 gutenprint
deb http://
Maybe this has something to do with it.