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A VPS provider offers its users the ability to install and run any distribution, provided that you upload a bootable ISO image.

I'd like to run Ubuntu Core, however I haven't found a way to convert the images that Canonical provides to a bootable ISO.

qemu-img reports that the image is in raw format:

[chb]$ qemu-img info ubuntu-core-18-amd64.img
image: ubuntu-core-18-amd64.img
file format: raw
virtual size: 3.6G (3879731200 bytes)
disk size: 302M

I can use VirtualBox's VBoxManage tool to convert this "raw" image to a virtual disk that VirtualBox will recognize and boot:

VBoxManage convertfromraw ubuntu-core-18-amd64.img --format VDI \ 
    ubuntu-core-18-amd64.vdi

I've looked at iat but it seems focused on converting various flavors of optical disc images to one another. I thought raw2iso might do the trick...

raw2iso MODE1 < ubuntu-core-18-amd64.img > ubuntu-core-18-amd64.iso

...but, even though the byte size of the img file is a multiple of 2048, the output isn't recognized by anything.

Here's what hdiutil imageinfo says about the img file:

Size Information:
    Total Bytes: 3879731200
    Compressed Ratio: 1
    Sector Count: 7577600
    Total Non-Empty Bytes: 3879731200
    Compressed Bytes: 3879731200
    Total Empty Bytes: 0
    ...
partitions:
    partition-scheme: GUID
    block-size: 512
    partitions:
            0:
                    partition-name: Protective Master Boot Record
                    partition-start: 0
                    partition-synthesized: true
                    partition-length: 1
                    partition-hint: MBR
            1:
                    partition-name: GPT Header
                    partition-start: 1
                    partition-synthesized: true
                    partition-length: 1
                    partition-hint: Primary GPT Header
            2:
                    partition-name: GPT Partition Data
                    partition-start: 2
                    partition-synthesized: true
                    partition-length: 32
                    partition-hint: Primary GPT Table
            3:
                    partition-name:
                    partition-start: 34
                    partition-synthesized: true
                    partition-length: 2014
                    partition-hint: Apple_Free
            4:
                    partition-UUID: E765AD58-B838-4A24-8C2A-E022D7BEF1E5
                    partition-name: BIOS Boot
                    partition-hint-UUID: 21686148-6449-6E6F-744E-656564454649
                    partition-start: 2048
                    partition-number: 1
                    partition-length: 2048
                    partition-hint: 21686148-6449-6E6F-744E-656564454649
            5:
                    partition-UUID: CC8F1CE4-0C99-4ECC-A757-FBC3FF6B9B71
                    partition-name: EFI System
                    partition-hint-UUID: C12A7328-F81F-11D2-BA4B-00A0C93EC93B
                    partition-start: 4096
                    partition-number: 2
                    partition-length: 102400

How can I convert this file to something that is recognized by most systems as a bootable, iso9660 image?

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