One problem I did encounter was that scrolling on my Magic Mouse 2 didn't work. Bluetooth, affecting Magic Keyboard & Mouse) have been sorted out in the latest version of Ubuntu.
#Mac mini as a server 2018 driver
#Mac mini as a server 2018 install
That's why you'll install rEFInd which replaces the default boot manager of your Mac. Installing Ubuntu without its boot manager GRUB means that you cannot easily start it by holding Option when booting your Mac.
![mac mini as a server 2018 mac mini as a server 2018](https://www.sonnettech.com/product/images/hdr_rackmacmini-050720.jpg)
When asked where to install, select "Something Different".Just wait for the installer window to appear and then proceed (this can take a few seconds). This seems to be due to ubiquity's implementation and can be ignored. A warning will appear, that deprecated modules are being used. This way the installer won't try to install the GRUB boot manager which always failed for me. Now comes the part that took me forever to figure out: launch the Ubuntu installer via terminal with the command ubiquity -b.In the dialog that will appear, select "Try Ubuntu" to enter a live session.
![mac mini as a server 2018 mac mini as a server 2018](https://www.macworld.com/wp-content/uploads/2021/11/mac-mini-2018-ports-5.jpg)
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.
#Mac mini as a server 2018 mac
Reboot your Mac and hold the Option key while it is starting.
![mac mini as a server 2018 mac mini as a server 2018](https://i.ytimg.com/vi/IVqKmzZpyM4/maxresdefault.jpg)
Select "No Security" and "Allow Booting from External Drive".
![mac mini as a server 2018 mac mini as a server 2018](https://9to5mac.com/wp-content/uploads/sites/6/2020/04/The-Rewind-Mac-mini-2018-Desktop.jpg)
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.