ubuntu 9.10 no cd detected, cannot run CD menu

[guest2013-1]

as per the title, I load the iso up into my daemon tools and the autorun doesn't want to work. says "no cd detected, cannot run CD menu"

apparently that bug has been fixed in alpha 3 already...

So i extracted all the files, tried again, no luck.

ran wubi.exe as is (without the --cdmenu option) and got the installer, only to let it start downloading the iso again through torrent...

So I figured I'd try running it off of the CD (mounted by Daemon Tools)

same thing.

why the **** would I download 500+megs for an iso I have to download again just to install????

 

[rurapente]

hmmm. had something similar except my CD wouldnt boot. wrote a few, nothing.

deleted the file, re-downloaded again from another source and worked fine. I wrote it off as a corrupt ISO.

Maybe check MD5s?

 

[sn3rd]

+1 for for checking MD5...

Tried bootable flash memory?

 

[guest2013-1]

How do I check MD5? (got it off of mirror.ac.za)

 

[sn3rd]

How do I check MD5? (got it off of mirror.ac.za)

use md5sum

There are Windows as well as Linux versions available (I'd assume for OSX too).

Then compare it to the MD5 provided wherever you downloaded from.

MD5 is a one-way hash; i.e. it "digests" some variable-length data into a fixed-length string of bits. Now, without getting into the details of why MD5 isn't really perfectly secure, let's just assume that it IS secure, and that it's pretty much impossible to bypass.

Basically, if you put some data through the MD5 algorithm, it produces some bits (which we read off as hex digits). It is, for all practical purposes, impossible to
1) Reverse the result of the MD5 (the one-way property)
2) Find another piece of data with the same MD5 (weak collision resistance)
3) Create some data that has the same MD5 (strong collision resistance)

So, to sum up, if you generate the MD5 of the downloaded ISO, and it matches the MD5 provided wherever you downloaded, you can be pretty sure that the file downloaded with no errors.

 

[chopsuey]

Download the file, MD5SUMS from the same path as where you downloaded the iso from.

file should look something like this:

836440698456aa2936a4347b5485fdd6 *ubuntu-9.10-alternate-amd64.iso
3faa345d298deec3854e0e02410973dc *ubuntu-9.10-alternate-i386.iso
dc51c1d7e3e173dcab4e0b9ad2be2bbf *ubuntu-9.10-desktop-amd64.iso
d91659de6e945dbb96eb8970b2b4590a *ubuntu-9.10-desktop-armel+dove.img
297875d2a7531824a0fb08f241d33e85 *ubuntu-9.10-desktop-armel+imx51.img
8790491bfa9d00f283ed9dd2d77b3906 *ubuntu-9.10-desktop-i386.iso
ed6e77587b87fe0d92a2f21855869f00 *ubuntu-9.10-netbook-remix-i386.iso
14707e8847b9c9ba2dd1869fb5086e4f *ubuntu-9.10-server-amd64.iso
55618ad5f180692f9dac20cbff352634 *ubuntu-9.10-server-i386.iso
37a04db193b1a342f961f59aea2fada8 *wubi.exe

You need a md5sum program for you current os to calculate checksum of your iso (the md5sum command ships with all unix like OSes. For Windows you will have to google how it is done, some cd/dvd writing apps should also be able to calculate a .iso file's md5sum hash/checksum)



in Linux/Unix/OSX:

$ md5sum ubuntu-9.10-desktop-i386.iso
8790491bfa9d00f283ed9dd2d77b3906  ubuntu-9.10-desktop-i386.iso

compare the first column (md5hash) with the corresponding iso from the MD5SUMS file, if they match, your iso is fine.


Another way in Linux. If you downloaded the MD5SUMS file, run the command, md5sum -c MD5SUMS , in the same dir as the iso you want to check..... ignore read errors of files not present

$ md5sum -c MD5SUMS 
md5sum: ubuntu-9.10-alternate-amd64.iso: No such file or directory
ubuntu-9.10-alternate-amd64.iso: FAILED open or read
md5sum: ubuntu-9.10-alternate-i386.iso: No such file or directory
ubuntu-9.10-alternate-i386.iso: FAILED open or read
md5sum: ubuntu-9.10-desktop-amd64.iso: No such file or directory
ubuntu-9.10-desktop-amd64.iso: FAILED open or read
md5sum: ubuntu-9.10-desktop-armel+dove.img: No such file or directory
ubuntu-9.10-desktop-armel+dove.img: FAILED open or read
md5sum: ubuntu-9.10-desktop-armel+imx51.img: No such file or directory
ubuntu-9.10-desktop-armel+imx51.img: FAILED open or read
[B]ubuntu-9.10-desktop-i386.iso: OK[/B]
md5sum: ubuntu-9.10-netbook-remix-i386.iso: No such file or directory
ubuntu-9.10-netbook-remix-i386.iso: FAILED open or read
md5sum: ubuntu-9.10-server-amd64.iso: No such file or directory
ubuntu-9.10-server-amd64.iso: FAILED open or read
md5sum: ubuntu-9.10-server-i386.iso: No such file or directory
ubuntu-9.10-server-i386.iso: FAILED open or read
md5sum: wubi.exe: No such file or directory
wubi.exe: FAILED open or read

 

[MyWorld]

K3B does auto MD5 checking for you, once you gave it an ISO to burn it will check the MD5 of the ISO and you can then compare to see if it is complete, great feature!