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Am I understanding your question right, are you provisioning a new EC2 instance and then selecting Graviton instance type, and then using an Ubuntu x86_64 AMI with it?
Graviton is a completely different processor architecture to x86_64. You will need to build an x86_64 instance from an x86_64 AMI, and a Graviton instance from a Graviton AMI.
You can't mix them.
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I don't want mix I need use x86_64 after build all on arm so i need to take ami from arm and build need instance with x86_64 but when do this get error Instance reachability check failed
I'm not clear on what you are trying to do here.
So you have built an instance on Arm (Graviton), and this works, and is good?
Why do you need to build with x86_64 when you have already built with Arm?
Are you trying to create a new AMI from the running Arm instance, and use that newly-created AMI to build a new instance on an x86_64 instance type?
If I've not understood properly then apologies, and could you try explaining again what you ahve already done successfully, and what you still need to do.
Yes, I trying to create a new AMI from the running Arm instance, and use that newly-created AMI to build a new instance on an x86_64 instance type
That won't be possible - the new AMI you created from the running Arm instance can only be used to provision a new Arm instance.