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I just finished downloading Ubuntu on my mac and I tried to open it but it says it can't be opened because "it has no mountable file systems". I have no idea what this means, can anyone help?

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OSx is unable to verify the image and throws an error stating that the .iso file does not contain a recognizable filesystem. This link should help.

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I'm assuming you downloaded the ISO. What are you trying to get out of it? If your goal is to install Ubuntu, you'd need to burn the ISO to a disc or put it on a flash drive to boot from it. There's no 'installation package' for Ubuntu on mac.

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If you want to try or install Ubuntu on your mac, first you have to burn the iso to a CD, reboot and keep pressed the C key when it starts before it appears the apple logo and will boot from the CD with the Ubuntu iso.

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