[lug:18788] dd not creating bootable ISO files

2023-02-16 Thread sami....@gmail.com 
I've customized a Ubuntu 20.04 boot USB instance.  The install works fine 
and is completely automated.  I can use dd to create a copy of the USB, 
that is coy USB to USB.  That works fine.  

However I need to create a file based image of the iso to distribute to 
users.

dd commands copies the data to another USB but does not make it bootable.

An ideas?  Thanks in advance.

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Re: [lug:18788] dd not creating bootable ISO files

2023-02-16 Thread Jeremiah Bess 
Can you share the commands you are using leading up to the point where it
doesn't work?

Jeremiah Bess


On Thu, Feb 16, 2023 at 8:53 AM sami@gmail.com 
wrote:

> I've customized a Ubuntu 20.04 boot USB instance.  The install works fine
> and is completely automated.  I can use dd to create a copy of the USB,
> that is coy USB to USB.  That works fine.
>
> However I need to create a file based image of the iso to distribute to
> users.
>
> dd commands copies the data to another USB but does not make it bootable.
>
> An ideas?  Thanks in advance.
>
> --
> --
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> 
> .
>

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Re: [lug:18790] dd not creating bootable ISO files

2023-02-16 Thread sami....@gmail.com 
I've tried the following, none worked...

dd if=/dev/sda1 of=/ubuntu.iso bs=4K  
mkisofs  -o  /dev/sda  /
mkisofs  -o  /dev/sda1  /

Those commands will create a the data o the iso, however the iso does not 
boot.

thanks,
On Thursday, February 16, 2023 at 10:54:47 AM UTC-5 Jeremiah Bess wrote:

> Can you share the commands you are using leading up to the point where it 
> doesn't work?
>
> Jeremiah Bess
>
>
> On Thu, Feb 16, 2023 at 8:53 AM sami@gmail.com  
> wrote:
>
>> I've customized a Ubuntu 20.04 boot USB instance.  The install works fine 
>> and is completely automated.  I can use dd to create a copy of the USB, 
>> that is coy USB to USB.  That works fine.  
>>
>> However I need to create a file based image of the iso to distribute to 
>> users.
>>
>> dd commands copies the data to another USB but does not make it bootable.
>>
>> An ideas?  Thanks in advance.
>>
>> -- 
>> -- 
>> You received this message because you are subscribed to the Linux Users 
>> Group.
>> To post a message, send email to linuxus...@googlegroups.com
>> To unsubscribe, send email to linuxusersgro...@googlegroups.com
>> For more options, visit our group at 
>> http://groups.google.com/group/linuxusersgroup
>> References can be found at: http://goo.gl/anqri
>> Please remember to abide by our list rules (http://tinyurl.com/LUG-Rules)
>> --- 
>> You received this message because you are subscribed to the Google Groups 
>> "Linux Users Group" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to linuxusersgro...@googlegroups.com.
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/linuxusersgroup/368bfa97-5a5b-426b-a75f-9e1844ab24e9n%40googlegroups.com
>>  
>> 
>> .
>>
>

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Re: [lug:18790] dd not creating bootable ISO files

2023-02-16 Thread Jeremiah Bess 
So if your USB device is /dev/sda, the sda1 is just a single partition on
that drive. The boot loader is stored in the first blocks at the beginning
of the USB drive: sda not sda1

The sda drive is typically the first drive used to boot an OS. So just a
note, you probably shouldn't try to create an ISO image from an OS that is
currently running. Files are changing all the time and could cause
corruption. Rather, boot to some other OS to run the dd command (assuming
it's a Linux OS you booted to).

Try this, replacing sdX with the USB device path (do not use partition
numbers at the end) you want to clone (use df -hT to list possibilities,
but be sure which you choose!):
sudo dd if=/dev/sdX of=ubuntu.iso

This command copies the entire drive contents, the boot sector and any
partitions. As an example, I have a bootable flash drive with Ventoy
installed. If I want to make an .iso of that, I would first boot to an OS
on my hard drive, in this case, Linux Mint. Next, I need to find the drive
path:

jbess@scooter:~$ df -hT
df: /run/user/1000/doc: Operation not permitted
Filesystem  Type  Size  Used Avail Use% Mounted on
udevdevtmpfs   15G 0   15G   0% /dev
tmpfs   tmpfs 3.0G  1.6M  3.0G   1% /run
/dev/mapper/lvmlmde-rootext4  428G  215G  191G  53% /
tmpfs   tmpfs  15G   98M   15G   1% /dev/shm
tmpfs   tmpfs 5.0M  4.0K  5.0M   1% /run/lock
/dev/sda1   vfat  286M  5.8M  280M   3% /boot/efi
tmpfs   tmpfs 3.0G  176K  3.0G   1% /run/user/1000
/dev/sdb2   vfat   32M   28M  4.7M  86%
/media/jbess/VTOYEFI
/dev/sdb1   exfat  29G   23G  6.5G  78%
/media/jbess/Ventoy

In this case, */dev/sdb* is the drive path, and I'm ignoring the two
numbered partitions listed there. Next, I would run the dd command:

*sudo dd if=/dev/sdb of=ventoy.iso*

Does that help? Another alternative is to use another bootable CD/DVD like
Clonezilla or some other drive cloning software. Most can create an .iso
from an existing file system.

Jeremiah Bess


On Thu, Feb 16, 2023 at 1:14 PM sami@gmail.com 
wrote:

> I've tried the following, none worked...
>
> dd if=/dev/sda1 of=/ubuntu.iso bs=4K
> mkisofs  -o  /dev/sda  /
> mkisofs  -o  /dev/sda1  /
>
> Those commands will create a the data o the iso, however the iso does not
> boot.
>
> thanks,
> On Thursday, February 16, 2023 at 10:54:47 AM UTC-5 Jeremiah Bess wrote:
>
>> Can you share the commands you are using leading up to the point where it
>> doesn't work?
>>
>> Jeremiah Bess
>>
>>
>> On Thu, Feb 16, 2023 at 8:53 AM sami@gmail.com 
>> wrote:
>>
>>> I've customized a Ubuntu 20.04 boot USB instance.  The install works
>>> fine and is completely automated.  I can use dd to create a copy of the
>>> USB, that is coy USB to USB.  That works fine.
>>>
>>> However I need to create a file based image of the iso to distribute to
>>> users.
>>>
>>> dd commands copies the data to another USB but does not make it bootable.
>>>
>>> An ideas?  Thanks in advance.
>>>
>>> --
>>> --
>>> You received this message because you are subscribed to the Linux Users
>>> Group.
>>> To post a message, send email to linuxus...@googlegroups.com
>>> To unsubscribe, send email to linuxusersgro...@googlegroups.com
>>> For more options, visit our group at
>>> http://groups.google.com/group/linuxusersgroup
>>> References can be found at: http://goo.gl/anqri
>>> Please remember to abide by our list rules (http://tinyurl.com/LUG-Rules
>>> )
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>>> You received this message because you are subscribed to the Google
>>> Groups "Linux Users Group" group.
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>>> 
>>> .
>>>
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