cacho@musix2:~$ gksu leafpad /etc/apt/sources.list
/usr/share/themes/Taqua/gtk-2.0/gtkrc:54: Clearlooks configuration option "sunkenmenu" is not supported and will be ignored.
/usr/share/themes/Taqua/gtk-2.0/gtkrc:55: Clearlooks configuration option "menuitemstyle" is not supported and will be ignored.
/usr/share/themes/Taqua/gtk-2.0/gtkrc:56: Clearlooks configuration option "listviewitemstyle" is not supported and will be ignored.
/usr/share/themes/Taqua/gtk-2.0/gtkrc:57: Clearlooks configuration option "progressbarstyle" is not supported and will be ignored.
/usr/share/themes/Taqua/gtk-2.0/gtkrc:54: Clearlooks configuration option "sunkenmenu" is not supported and will be ignored.
/usr/share/themes/Taqua/gtk-2.0/gtkrc:55: Clearlooks configuration option "menuitemstyle" is not supported and will be ignored.
/usr/share/themes/Taqua/gtk-2.0/gtkrc:56: Clearlooks configuration option "listviewitemstyle" is not supported and will be ignored.
/usr/share/themes/Taqua/gtk-2.0/gtkrc:57: Clearlooks configuration option "progressbarstyle" is not supported and will be ignored.
su
wget -O- -q http://mozilla.debian.net/archive.asc | apt-key add -


como no pasaba nada abrí otra consola: