Issue Detection
Before installation, we check to see if installation is possible and all the correct conditions are met.
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These checks should be presented in order of severity. In other words, who cares about plugging your laptop in if there's not enough space on your VM.
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If a check is fatal, it only offers the option "Cancel Installation" as the system cannot be installed
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If a check is non-fatal, it offers the options "Cancel Installation" and "Ignore" as this is a recommendation and we can still technically proceed.
Here are the checks in order:
There is not enough room on your device to install elementary. We recommend a minimum of 5 GB of storage. This should detect that at least one disk has enough total space to install. This is not a check of free space, as an option is to do a clean installation; we're just checking the actual size of each disk.
Your device doesn't meet the recommended hardware requirements. This may cause it to run slowly or freeze.
You appear to be installing in a virtual machine. Some parts of elementary OS may run slowly, freeze, or not function properly in a virtual machine. It's recommended to install on real hardware.
Your device is running on battery power. It's recommended to be plugged in while installing elementary OS.