The new installer needs a new boot command and preseed approach entirely. 
These should help you out:

https://github.com/nickcharlton/packer-ubuntu-2004
https://nickcharlton.net/posts/automating-ubuntu-2004-installs-with-packer.html

Back when I published these, I did try it out with VirtualBox and it worked 
(I happen to have a preference for VMWare but it's not important to this).

I _think_ there's an ISO that Ubuntu host that continues to have the old 
installer (which I think bento might have gone with?), but it'd be more 
future proof to embrace the new installer.

Let me know if you have any questions!

- Nick

On Saturday, 13 June 2020 19:29:32 UTC+1, Benjamin Lu wrote:
>
> Sorry, yeah well it seems like it only has the live dvd which doesn't 
> have. the actual without the live one. I'm sure it'll come out when 20.04.1 
> comes out. my best guess.
>
> http://cdimage.ubuntu.com/ubuntu/releases/20.04/release/ubuntu-20.04-live-server-arm64.iso
>
> On Saturday, June 13, 2020 at 11:22:53 AM UTC-7, Benjamin Lu wrote:
>>
>> Opps. sorry.
>>
>> On Sat, Jun 13, 2020 at 10:41 AM Elhanan Maayan <[email protected] 
>> <javascript:>> wrote:
>>
>>> this is for ubuntu 12
>>>
>>> On Fri, Jun 12, 2020 at 7:45 PM Benjamin Lu <[email protected] 
>>> <javascript:>> wrote:
>>>
>>>> I might be wrong,, but do u have this settings 
>>>>
>>>> "checksum_type": "sha256",
>>>> "checksum_url": "
>>>> http://cdimage.ubuntu.com/ubuntu/releases/12.04/release/SHA256SUMS";,
>>>> "image_url": "
>>>> http://cdimage.ubuntu.com/ubuntu/releases/12.04/release/ubuntu-12.04.5-dvd-amd64.iso
>>>> "
>>>>
>>>>
>>>> On Friday, June 12, 2020 at 3:23:49 AM UTC-7, Elhanan Maayan wrote:
>>>>>
>>>>> ubuntu 20 decided to ditch the D-I installer, and go with subiquity 
>>>>> something that some folks think unstable, 
>>>>>
>>>>> there's only one example of how to do (for vmware), and when i tried 
>>>>> it , it didn't work (i was stuck in language selection) 
>>>>>
>>>>> i know they still provide a distor with legacy d-i, but they say it's 
>>>>> not supported. 
>>>>>
>>>>>
>>>>> https://discourse.ubuntu.com/t/server-installer-plans-for-20-04-lts/13631/58
>>>>>
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>>
>>
>> -- 
>> Benjamin Lu
>> WordPress Theme & Plugin Developer
>> WordPress Theme Review Team
>> Website: Portfolio <https://benjlu.com>
>> Website: Blog <https://benlu.blog>
>> WordPress: Profile <https://profiles.wordpress.org/benlumia007>
>>
>

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