You're presented with various options of which you'll choose the first one "Ubuntu". Select the "EFI Drive" - that is the boot stick you just created. Reboot your Mac and hold the Option key while it is starting.Select "No Security" and "Allow Booting from External Drive". Disable the T2 Boot Security: Reboot and hold Command+R.Choose some name like "UBUNTU", Format "MS-DOS (FAT)" and Scheme "GUID Partition Map". Select your new partition and click "Erase".You are going to need at least 25 GB - I chose to allocate 50 GB which is enough for my use case. For the Linux partition, open Disk Utility, select the hard drive where you want to install Ubuntu and click "Partition".Follow the instructions in the link above for creating the boot stick.So here goes: Preparationsįor the installation, you're going to need a bootable USB stick and a partition on your Mac's internal drive or an external drive where the final installation shall reside. Another source is this Reddit post which, however, is more complicated than necessary IMO. The most important sources turned out to be a great answer here that also covers installing Windows, but lacks information about installing on newer Macs with a T2 chip. After struggling with this for many hours I thought I'd provide an updated write-up for installing Ubuntu 20.04 on a Mac mini 2018 running macOS Catalina.
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