comment for https://bugs.launchpad.net/bugs/496995 ;

So,DVD burn (use brasero, dvd+rw-tools on edubuntu, power2go on windows and more) its
 defficalt! relentd five medias at non-error progress ;-). 
because '$ sudo if=/dev/dvd | md5sum' are copy sizing smally!

Next try to burn use k3b as  successd!

~$ LANG=C sudo dd if=/dev/dvd | md5sum
7032204+0 records in
7032204+0 records out
3600488448 bytes (3.6 GB) copied, 25.47 s, 141 MB/s
5fb95feedf2f58f107e2856d86908976  -

$ cat MD5SUMS 
5fb95feedf2f58f107e2856d86908976 *edubuntu-9.10-dvd-amd64.iso
f0111dc25bc6c1a617fd5ab686b945c0 *edubuntu-9.10-dvd-i386.iso

$ md5sum edubuntu-9.10-dvd-amd64.iso 
5fb95feedf2f58f107e2856d86908976  edubuntu-9.10-dvd-amd64.iso

It's excelent.

Now, claen install edubutu form dvd media. And logon.

~$ sudo md5sum /dev/dvd
5fb95feedf2f58f107e2856d86908976  /dev/dvd

checking hash of download file are;

~$ sudo apt-cache show ltsp-client-core
Package: ltsp-client-core
Priority: extra
Section: misc
Installed-Size: 560
Maintainer: Stephane Graber <email address hidden>
Architecture: amd64
Source: ltsp
Version: 5.1.90-0ubuntu3
Depends: libc6 (>= 2.7), libpopt0 (>= 1.14), libx11-6, lsb-base, nbd-client, initramfs-tools (>= 0.11), syslinux, lsb-release, kbd, console-setup, python, tftp-hpa, python-serial, numlockx, udhcpc, cron
Pre-Depends: debconf (>= 0.5) | debconf-2.0
Filename: pool/main/l/ltsp/ltsp-client-core_5.1.90-0ubuntu3_amd64.deb
Size: 101544
MD5sum: fcdf305e9e0a480c6306a496f20f85ad
SHA1: fceea34f0e302f50ae2a0b96d5273a0431d226a8
SHA256: d82204c76d03ce2104f2aa95ccea0c953745f8569a06e281f12a714fd477bb86
Description: LTSP client environment (core)
 The scripts needed to configure and boot an LTSP client.
 .
 DO NOT install this package on a regular machine, it is intended only
 for installation inside a LTSP client filesystem.
Homepage: http://www.ltsp.org
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu

~$ md5sum /var/cache/apt/archives/ltsp-client-core_5.1.90-0ubuntu3_amd64.deb 
fcdf305e9e0a480c6306a496f20f85ad  /var/cache/apt/archives/ltsp-client-core_5.1.90-0ubuntu3_amd64.deb

~$ sudo apt-cache show ltsp-client
Package: ltsp-client
Priority: optional
Section: misc
Installed-Size: 72
Maintainer: Stephane Graber <email address hidden>
Architecture: all
Source: ltsp
Version: 5.1.90-0ubuntu3
Depends: ltsp-client-core, ldm | x-display-manager, pulseaudio-esound-compat, ltspfsd, libgl1-mesa-dri, xorg, laptop-detect, inputattach, usplash, dmz-cursor-theme, usplash-theme-ubuntu, libasound2-plugins, pulseaudio, alsa-utils, alsa-base, sshfs, hal, dbus, rdesktop, wget, sane-utils, cups-bsd
Suggests: cryptsetup
Filename: pool/main/l/ltsp/ltsp-client_5.1.90-0ubuntu3_all.deb
Size: 42412
MD5sum: 88788045895a6eb3baae16d3cb6896fd
SHA1: 5d33d4eefda6fe4815ea103d64d59d6088fab5dc
SHA256: f3f9238046b4c446d3d87e745fb3bbecbd95ec8f7d3021450a870081aab072c8
Description: LTSP client environment
 The scripts needed to configure and boot an LTSP client.
Homepage: http://www.ltsp.org
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
~$ md5sum /var/cache/apt/archives/ltsp-client_5.1.90-0ubuntu3_all.deb 
88788045895a6eb3baae16d3cb6896fd  /var/cache/apt/archives/ltsp-client_5.1.90-0ubuntu3_all.deb

Next, retry install;

~$ LANG=C sudo apt-get install -f
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
  ltsp-client-core
The following NEW packages will be installed:
  ltsp-client-core
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0B/102kB of archives.
After this operation, 573kB of additional disk space will be used.
Do you want to continue [Y/n]? 
Preconfiguring packages ...
(Reading database ... 170423 files and directories currently installed.)
Unpacking ltsp-client-core (from .../ltsp-client-core_5.1.90-0ubuntu3_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/ltsp-client-core_5.1.90-0ubuntu3_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/ltsp-client-core_5.1.90-0ubuntu3_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

On inttall error message are;

│ Installation aborted                                                 │ 
│                                                                      │ 
│ ltsp-client cannot be installed in a regular machine. This package   │ 
│ provides the basic structure for a LTSP terminal.                    │ 
│                                                                      │ 
│ Please read the package description to understand what it means.     │ 

Umm...

TAHNKS for they reply comments.