I met a similar issue and fail to install Ubuntu EDIT 2: it's up to 5K. You can use the following section in grub. Basic Installation Procedure The basic installation of Ubuntu is not really different from installing on any other Mac, but there is some software that you really need in addition in order to boot via EFI. Nouveau and proprietary nvidia drivers hang graphics display upon enabling, although it's possible to ssh into the system and it functions fine otherwise.
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