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1. How to install Ubuntu 20.04.3 LTS on iMac, Macbook air, Mac mini?

1. Create a bootable USB stick on macOS (https://ubuntu.com/tutorials/create-a-usb-stick-on-macos#1-overview)
2. Download the Etcher (https://etcher.io/) which is very convenient to use.
3. Prepare a 15 Gb USB which is going to be a USB flash drive.

2. How to create a bootable installer for macOS

1. In this way user can downgrade the macOS system. https://support.apple.com/en-ca/HT201372
2. To install the new system, Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.

3. How to recover the USB flash drive to normal use?

1. Set the format to MS-DOS (FAT)
2. https://askubuntu.com/questions/285539/detect-and-mount-devices

4. How to install Ubuntu on Mac Mini?

1. Installation of Ubuntu on Mac Mini https://nsrc.org/workshops/2014/nsrc-ubuntunet-trainers/raw-attachment/wiki/Agenda/install-ubuntu-mac-mini.htm
2. Ubuntu 20.04 on Mac mini 2020 https://askubuntu.com/questions/1256686/cannot-install-ubuntu-20-04-on-mac-mini-2020

5. How to use VirtualBox to have Ubuntu, Windows and macOS on same computer?

1. Install Ubuntu on VirtualBox https://www.wikihow.com/Install-Ubuntu-on-VirtualBox

6. How to build a local server on Ubuntu?

(Upcoming)