Cfrgtkky

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?