As a workaround, I did this to replace the problematic comments with ASCII-friendly ones. Notice that this only works with the Spanish locale. You must replace the message according with what message is shown to you on the comment section.
sudo sed -ri 's/(.*)\(desactivado en la actualización a raring\)(.*)/\1disabled on update\2/' /etc/apt/sources.list.d/*.list
As a workaround, I did this to replace the problematic comments with ASCII-friendly ones. Notice that this only works with the Spanish locale. You must replace the message according with what message is shown to you on the comment section.
sudo sed -ri 's/(.*) \(desactivado en la actualización a raring\ )(.*)/\ 1disabled on update\2/' /etc/apt/ sources. list.d/ *.list