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--- system_protocol [2021/09/12 12:25] – 134.190.232.139
+++ system_protocol [2021/10/11 19:14] (current) – 134.190.232.9
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   - In this way user can downgrade the macOS system. https://support.apple.com/en-ca/HT201372
   - To install the new system, Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
+  - To install back MacOS, need to erase the original ubuntu on the MAC first. https://support.apple.com/en-us/HT208496 (Test OK)
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   - Installation of Ubuntu on Mac Mini https://nsrc.org/workshops/2014/nsrc-ubuntunet-trainers/raw-attachment/wiki/Agenda/install-ubuntu-mac-mini.htm
   - Ubuntu 20.04 on Mac mini 2020 https://askubuntu.com/questions/1256686/cannot-install-ubuntu-20-04-on-mac-mini-2020
-  - Install ubuntu 18.04 on mac mini 2018 https://askubuntu.com/questions/1127375/install-ubuntu-18-04-on-mac-mini-2018 (Test OK) Note: the MAC after 2018 have security setting which need to be turned off to install ubuntu.
+  - Install ubuntu 18.04 on mac mini 2018 https://askubuntu.com/questions/1127375/install-ubuntu-18-04-on-mac-mini-2018 (Test OK)
+Note: the MAC after 2018 have security setting which need to be turned off to install ubuntu; The external keyboard is needed instead of the apple bluetooth mouse.
 **5. How to use VirtualBox to have Ubuntu, Windows and macOS on same computer?**