Faltou uma, apenas para padronizar, mude-a também para bak
sudo mv intellinuxgraphics.list.save intellinuxgraphics.list.save-bak
-M3:/etc/apt/sources.list.d$ ls /etc/apt/sources.list.d
blueman-ppa-trusty.list-bak
blueman-ppa-trusty.list.distUpgrade-bak
blueman-ppa-trusty.list.save-bak
getdeb.list
getdeb.list.save
inameiname-stable-trusty.list-bak
inameiname-stable-trusty.list.distUpgrade-bak
inameiname-stable-trusty.list.save-bak
inameiname-ubuntu-stable-xenial.list
intellinuxgraphics.list-bak
intellinuxgraphics.list.distUpgrade-bak
intellinuxgraphics.list.save-bak
opera-stable.list
opera-stable.list.save
otto-kesselgulasch-ubuntu-gimp-xenial.list
otto-kesselgulasch-ubuntu-gimp-xenial.list.save
rebuntu16-ubuntu-avidemux_unofficial-xenial.list
rebuntu16-ubuntu-avidemux_unofficial-xenial.list.save
webupd8team-java-trusty.list-bak
webupd8team-java-trusty.list.distUpgrade-bak
webupd8team-java-trusty.list.save-bak