I ran both aptitude update and apt-get update:
It seems I still have some problems. Note last three lines of each result:
aptitude update
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 2008102 3-23:00] etch Release.gpg
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 2008102 3-23:00] etch Release
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 2008102 3-23:00] etch/contrib Packages/DiffIndex
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 2008102 3-23:00] etch/main Packages/DiffIndex
Get:1
http://www.debian-multimedia.org etch Release.gpg [197B]
Get:2
http://ftp.esat.net etch Release.gpg [386B]
Get:3
http://www.debian-multimedia.org etch Release [8347B]
Hit
http://ftp.esat.net etch Release
Get:4
http://www.backports.org etch-backports Release.gpg [189B]
Get:5
http://www.backports.org etch-backports Release [72.9kB]
Get:6
http://security.debian.org etch/updates Release.gpg [197B]
Ign
http://ftp.esat.net etch/main Packages/DiffIndex
Ign
http://www.debian-multimedia.org etch/main Packages/DiffIndex
Ign
http://ftp.esat.net etch/main Sources/DiffIndex
Hit
http://ftp.esat.net etch/main Packages
Hit
http://security.debian.org etch/updates Release
Hit
http://ftp.esat.net etch/main Sources
Hit
http://www.debian-multimedia.org etch/main Packages
Ign
http://security.debian.org etch/updates/main Packages/DiffIndex
Get:7
ftp://ftp.debian.org ../project/experimental Release.gpg [197B]
Ign
http://www.backports.org etch-backports Release
Ign
http://security.debian.org etch/updates/contrib Packages/DiffIndex
Ign
http://security.debian.org etch/updates/main Sources/DiffIndex
Ign
http://security.debian.org etch/updates/contrib Sources/DiffIndex
Hit
http://www.backports.org etch-backports/main Packages/DiffIndex
Hit
http://security.debian.org etch/updates/main Packages
Hit
http://security.debian.org etch/updates/contrib Packages
Hit
http://security.debian.org etch/updates/main Sources
Hit
http://www.backports.org etch-backports/contrib Packages/DiffIndex
Get:8
ftp://ftp.debian.org ../project/experimental Release [76.6kB]
Get:9
http://www.backports.org etch-backports/main Packages [424kB]
Hit
http://security.debian.org etch/updates/contrib Sources
Hit
http://www.backports.org etch-backports/contrib Packages
Get:10
ftp://ftp.debian.org ../project/experimental/main Packages/DiffIndex [202 3B]
Hit
ftp://ftp.debian.org ../project/experimental/contrib Packages/DiffIndex
Hit
ftp://ftp.debian.org ../project/experimental/non-free Packages/DiffIndex
Get:11
ftp://ftp.debian.org ../project/experimental/main 2009-03-16-1423.33.pdiff [1721B]
Get:12
ftp://ftp.debian.org ../project/experimental/main 2009-03-16-1423.33.pdiff [1721B]
Get:13
ftp://ftp.debian.org ../project/experimental/main 2009-03-16-1423.33.pdiff [1721B]
Fetched 586kB in 5s (112kB/s)
Reading package lists... Done
W: GPG error:
http://www.backports.org etch-backports Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EA8E8B2116BA136C
W: You may want to run apt-get update to correct these problems
**********************************************************************************************
zaika:/home/siawash# apt-get update
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 20081023-23:00] etch Release.gpg
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 20081023-23:00] etch Release
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 20081023-23:00] etch/contrib Packages/DiffIndex
Ign cdrom://[Debian GNU/Linux 4.0 r5 _Etch_ - Official i386 DVD Binary-1 20081023-23:00] etch/main Packages/DiffIndex
Get:1
http://ftp.esat.net etch Release.gpg [386B]
Hit
http://ftp.esat.net etch Release
Get:2
http://www.debian-multimedia.org etch Release.gpg [197B]
Get:3
http://www.backports.org etch-backports Release.gpg [189B]
Hit
http://www.debian-multimedia.org etch Release
Hit
http://www.backports.org etch-backports Release
Ign
http://ftp.esat.net etch/main Packages/DiffIndex
Ign
http://ftp.esat.net etch/main Sources/DiffIndex
Get:4
http://security.debian.org etch/updates Release.gpg [197B]
Get:5
ftp://ftp.debian.org ../project/experimental Release.gpg [197B]
Hit
http://ftp.esat.net etch/main Packages
Ign
http://www.debian-multimedia.org etch/main Packages/DiffIndex
Hit
http://ftp.esat.net etch/main Sources
Hit
http://security.debian.org etch/updates Release
Hit
http://www.debian-multimedia.org etch/main Packages
Err
http://www.backports.org etch-backports Release
Get:6
http://www.backports.org etch-backports Release [72.9kB]
Get:7
ftp://ftp.debian.org ../project/experimental Release [76.6kB]
Ign
http://security.debian.org etch/updates/main Packages/DiffIndex
Ign
http://www.backports.org etch-backports Release
Ign
http://security.debian.org etch/updates/contrib Packages/DiffIndex
Ign
http://security.debian.org etch/updates/main Sources/DiffIndex
Ign
http://security.debian.org etch/updates/contrib Sources/DiffIndex
Hit
http://www.backports.org etch-backports/main Packages/DiffIndex
Hit
http://security.debian.org etch/updates/main Packages
Hit
http://www.backports.org etch-backports/contrib Packages/DiffIndex
Hit
http://security.debian.org etch/updates/contrib Packages
Hit
http://security.debian.org etch/updates/main Sources
Hit
http://www.backports.org etch-backports/main Packages
Hit
http://security.debian.org etch/updates/contrib Sources
Hit
http://www.backports.org etch-backports/contrib Packages
Get:8
ftp://ftp.debian.org ../project/experimental/main Packages/DiffIndex [2023B]
Hit
ftp://ftp.debian.org ../project/experimental/contrib Packages/DiffIndex
Hit
ftp://ftp.debian.org ../project/experimental/non-free Packages/DiffIndex
Get:9
ftp://ftp.debian.org ../project/experimental/main 2009-03-16-2106.15.pdiff [3061B]
Get:10
ftp://ftp.debian.org ../project/experimental/main 2009-03-16-2106.15.pdiff [3061B]
Get:11
ftp://ftp.debian.org ../project/experimental/main 2009-03-16-2106.15.pdiff [3061B]
Fetched 155kB in 4s (35.9kB/s)
Reading package lists... Done
W: GPG error:
http://www.backports.org etch-backports Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EA8E8B2116BA136C
W: You may want to run apt-get update to correct these problems