sure can, but just found out about sources.list.d Apparently, It's some kind of extension of apt that's not always used. I'm still checking into it.
More info:
http://ubuntuforums.org/showthread.php?t=116400
Pretty much sums up the whole thing (post from someone who only uses .d) imo, I can see where it could be handy sometimes. just another way of doing things check it:
http://episteme.arstechnica.com/eve/for ... 5002889831
I found the offending repo @ /etc/apt/sources.list.d/ on my sys.
but here's the info you asked about sources is a little messy, long story
#8.10 Intrepid Ibex
deb http://us.archive.ubuntu.com/ubuntu/ intrepid main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-proposed main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu intrepid-security main restricted universe multiverse
#9.04 Jaunty Jackalope
deb http://apt.wicd.net jaunty extras
deb http://mirror.optus.net/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty main restricted universe multiverse #Added by software-properties
# deb-src http://mirror.anl.gov/pub/ubuntu jaunty main
deb http://mirror.optus.net/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty-proposed restricted main multiverse universe #Added by software-properties
# deb-src http://mirror.anl.gov/pub/ubuntu jaunty-proposed main
# deb http://mirror.optus.net/ubuntu/ jaunty universe multiverse
deb http://mirror.optus.net/ubuntu/ jaunty-proposed universe multiverse
#deb http://ppa.launchpad.net/team-xbmc/jaunty-ppa/ubuntu jaunty main
#deb-src http://ppa.launchpad.net/team-xbmc/jaunty-ppa/ubuntu jaunty main
deb http://mirror.optus.net/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty-security restricted main multiverse universe #Added by software-properties
deb http://mirror.optus.net/ubuntu/ jaunty-security universe multiverse
# deb-src http://mirror.anl.gov/pub/ubuntu jaunty-security main
deb http://archive.canonical.com/ubuntu jaunty-security partner
deb-src http://archive.canonical.com/ubuntu jaunty-security partner
deb http://mirror.optus.net/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty-updates main restricted universe multiverse #Added by software-properties
# deb http://mirror.optus.net/ubuntu/ jaunty-updates universe multiverse
# deb-src http://mirror.anl.gov/pub/ubuntu jaunty-updates main
deb http://archive.canonical.com/ubuntu jaunty-updates partner
deb-src http://archive.canonical.com/ubuntu jaunty-updates partner
deb http://archive.canonical.com/ubuntu jaunty partner
deb http://archive.canonical.com/ubuntu jaunty-proposed partner
deb-src http://archive.canonical.com/ubuntu jaunty partner
deb-src http://archive.canonical.com/ubuntu jaunty-proposed partner
# deb http://mirror.optus.net/ubuntu/ jaunty-backports main universe restricted multiverse
# deb-src http://mirror.anl.gov/pub/ubuntu jaunty-backports main
# deb http://archive.canonical.com/ubuntu jaunty-backports partner
# deb-src http://archive.canonical.com/ubuntu jaunty-backports partner
#Launchpad
deb http://ppa.launchpad.net/compiz/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/compiz/ppa/ubuntu jaunty main
# deb http://ppa.launchpad.net/netbook-remix-team/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/netbook-remix-team/ubuntu jaunty main
deb http://ppa.launchpad.net/lidaobing/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/lidaobing/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/asac/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/asac/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/globalmenu-team/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/globalmenu-team/ubuntu jaunty main
deb http://ppa.launchpad.net/themuso/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/themuso/ubuntu jaunty main
deb http://ppa.launchpad.net/zulcss/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/zulcss/ppa/ubuntu jaunty main
# deb http://ppa.launchpad.net/q-funk/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/q-funk/ubuntu jaunty main
# deb http://ppa.launchpad.net/ted-gould/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/ted-gould/ubuntu jaunty main
deb http://ppa.launchpad.net/hyperair/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/hyperair/ubuntu jaunty main
deb http://ppa.launchpad.net/bigon/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/bigon/ubuntu jaunty main
deb http://ppa.launchpad.net/gnomefreak/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/gnomefreak/ubuntu jaunty main
# deb http://ppa.launchpad.net/tormodvolden/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/tormodvolden/ubuntu jaunty main
deb http://ppa.launchpad.net/marceloshima/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/marceloshima/ubuntu jaunty main
deb http://ppa.launchpad.net/freenx-team/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/freenx-team/ubuntu jaunty main
deb http://ppa.launchpad.net/bhavi/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/bhavi/ubuntu jaunty main
deb http://ppa.launchpad.net/scott/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/scott/ubuntu jaunty main
deb http://ppa.launchpad.net/mlind/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/mlind/ubuntu jaunty main
deb http://ppa.launchpad.net/intuitivenipple/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/intuitivenipple/ubuntu jaunty main
deb http://ppa.launchpad.net/suraia/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/suraia/ubuntu jaunty main
deb http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/patryk-prezu/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/patryk-prezu/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/sportman1280/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/sportman1280/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/wordpress/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/wordpress/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/mythbuntu/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/mythbuntu/ubuntu jaunty main
deb http://ppa.launchpad.net/shutter/ppa/ubuntu jaunty main
# deb-src http://ppa.launchpad.net/shutter/ubuntu jaunty main
#deb http://ppa.launchpad.net/awn-testing/ppa/ubuntu jaunty main #avant-window-navigator
# deb http://ppa.launchpad.net/ubuntu-mozilla ... ppa/ubuntu jaunty main #firefox
deb http://ppa.launchpad.net/compiz/ppa/ubuntu jaunty main #compiz-fusion
deb http://ppa.launchpad.net/do-core/ppa/ubuntu jaunty main #gnome-do
deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu jaunty main #ubuntu-tweak
deb http://ppa.launchpad.net/gtg/ppa/ubuntu jaunty main #gtg
deb http://ppa.launchpad.net/do-core/ppa/ubuntu jaunty main #gnome-do
# deb http://ppa.launchpad.net/ubuntu-tweak-t ... ppa/ubuntu jaunty main #ubuntu-tweak
#Launchpad Entries
deb http://ppa.launchpad.net/tualatrix/ppa/ubuntu gutsy main
deb-src http://ppa.launchpad.net/tualatrix/ppa/ubuntu gutsy main
deb http://ppa.launchpad.net/compiz/ppa/ubuntu hardy main
deb http://packages.medibuntu.org/ jaunty free non-free
# deb http://cafelinux.org/Downloads/oz-os tinwoodman main
# deb http://deb.opera.com/opera/ lenny non-free #opera
deb http://dl.google.com/linux/deb/ stable non-free #google
# deb http://repository.cairo-dock.org/ubuntu intrepid cairo-dock
# deb http://repository.cairo-dock.org/ubuntu hardy cairo-dock
# deb http://repository.cairo-dock.org/ubuntu gutsy cairo-dock
***********************Errors***************
Hit http://ppa.launchpad.net hardy/main Packages
Ign http://ppa.launchpad.net jaunty/main Packages
Err http://ppa.launchpad.net jaunty/main Packages
404 Not Found
Fetched 4689B in 3s (1378B/s)
W: Failed to fetch http://repoubuntusoftware.info/dists/in ... 6/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/team-xbmc-intr ... 6/Packages 404 Not Found
E: Some index files failed to download, they have been ignored, or old ones used instead.