download of version 11.04 won't auto run

...auto run?..

Normally you just put the disk in your player, reboot the machine and make sure the boot order is set to start from the player before the hard drive.

If it doesn't run from here then verify the disk and data integrity. Look at https://help.ubuntu.com/community/BurningIsoHowto

I am trying to verify the ISO image download with md5sum , as per the Ubuntu help page burning how to, you recommended.
Now I can't get into the correct directory to do it.
I opened a terminal and keyed the following:
cd downloads_directory
the terminal keeps telling me no such directory exists. I even copied and pasted the command from the Ubuntu instruction page and still got the same result. No such directory exists.
I am getting very frustrated with this please advise what I am doing wrong as patently the directory does exist. There are two profiles on this computer myself and my wife. Does this effect the cd command at all.

Did you replace "downloads_directory" by the real name of folder ?

Hi Delance, I am confused by your question. I am following the instructions from the Ubuntu instruction page to run the MD5Sum utility which I have pasted below. The instruction is as I understand it telling the system via the terminal to go to the Downloads directory which contains the ISO image. "cd download_directory" That is the command, or am I completely misunderstanding this procedure. The actual ISO image is a file in Home/ Peter/downloads . Are you saying the terminal command should be:
cd peter/download/(image filename).

Sorry if I am being thick here but I thought the statements inthe example below were specific commands to enter literally . please advise me where I am going wrong here.

MD5SUM on Linux

Most Linux distributions come with the md5sum utility so installation is usually unnecessary. We are going to use the Ubuntu 8.10 LiveCD for the following example:

Check the iso file

Manual method

First open a terminal and go to the correct directory to check a downloaded iso file:

    *

      cd download_directory

Then run the following command from within the download directory.

    *

      md5sum ubuntu-8.10-desktop-i386.iso

md5sum should then print out a single line after calculating the hash:

    *

      24ea1163ea6c9f5dae77de8c49ee7c03 ubuntu-8.10-desktop-i386.iso

Compare the hash (the alphanumeric string on left) that your machine calculated with the corresponding hash on the UbuntuHashes page.

Command should be:
   cd $HOME/download/(image filename)
You can also use:
   cd # go to user home folder
   cd download/(image filename)
Then, if you downloaded default 11.04 32bits installer:
   md5sum ubuntu-11.04-desktop-i386.iso
Which should display 8b1085bed498b82ef1485ef19074c281

Hi delance,
 Thanks for the response. You can see from the terminal responses I have pasted below things did not happen correctly with the command you sent me. Eventually by trial and error line 10 got me into the correct directory and from there running md5sum was fine producing the correct hash codes for both my downloaded versions of Ubuntu.

I am still puzzled as to why I could not get terminal to accept the full command including the file name, any thoughts based on the entries below.

$ cd $HOME/download/ubuntu-11.04-desktop-i386.iso
$: command not found
peter@peter-desktop:~$ cd $HOME/download/ubuntu-11.04-desktop-i386.iso
bash: cd: /home/peter/download/ubuntu-11.04-desktop-i386.iso: No such file or directory
peter@peter-desktop:~$ $ cd $HOME/download/ubuntu-11.04-desktop-i386.iso
$: command not found
peter@peter-desktop:~$ cd $HOME/download/ubuntu-11.04-desktop-i386.iso
bash: cd: /home/peter/download/ubuntu-11.04-desktop-i386.iso: No such file or directory
peter@peter-desktop:~$ cd $HOME/Download/ubuntu-11.04-desktop-i386.iso
bash: cd: /home/peter/Download/ubuntu-11.04-desktop-i386.iso: No such file or directory
peter@peter-desktop:~$ cd $HOME/Downloads/ubuntu-11.04-desktop-i386.iso
bash: cd: /home/peter/Downloads/ubuntu-11.04-desktop-i386.iso: Not a directory
peter@peter-desktop:~$ cd $HOME/Downloads
peter@peter-desktop:~/Downloads$ md5sum ubuntu-11.04-desktop-i386.iso
8b1085bed498b82ef1485ef19074c281 ubuntu-11.04-desktop-i386.iso
peter@peter-desktop:~/Downloads$ md5sum ubuntu-10.10-desktop-i386.iso
59d15a16ce90c8ee97fa7c211b7673a8 ubuntu-10.10-desktop-i386.iso
peter@peter-desktop:~/Downloads$

http://releases.ubuntu.com/11.04/ open the MD5SUMS link

this http://releases.ubuntu.com/11.04/MD5SUMS

8b1085bed498b82ef1485ef19074c281 *ubuntu-11.04-desktop-i386.iso

so your downloaded 11.04 iso is ok

Do the same with Ubuntu 10.10

http://releases.ubuntu.com/10.10/

What happen when you boot on CD ?
Did you burn Ubuntu ISO as a ISO image and not a usual file ?
Can you check you are able to boot on another bootable CD.