For the moment, CloudReady OS wipes your drive completely. So any prior installation will be wiped.
But once CloudReady is up and running, you can make room for another (linux) OS and dualboot. It’ll have to be a linux-installation because it works well with the Boot-menu (GRUB).
In order to do that you need to repartition your harddrive. There are about 12 partition on it, but there is only one (the largest boot partition) we are interested in. You will have to use a partition editor like Gparted. Here is howto get it running. (Or you can use the partitioner that comes with the live-image)
Make largest partition smaller to make room for a new OS-installation. Let’s say you free-d up 40GB. This space is now free and ‘unallocated’. If you are planning to use it for a Ubuntu-installation , then use this unallocated space to divide it into 3 parts:
- a boot partition ( at least 300 MB)
- a linux SWAP partition (2GB should be enough)
- a OS partition (the rest of the unallocated space)
Format the OS-partition to Ext4, and create the linux SWAP partition. The boot partition is left ‘unallocated’.
Install the new OS (their installer will format the boot partition)
Once the installation is complete, reboot and you will be presented with the GRUB-menu. Your Ubuntu will show first. CloudReady OS will be listed as ‘unknown system’.
Boot any you like and enjoy!
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