Installing Ubuntu 22.04 LTS was rather easy. Longest time was downloading the ISO image and burning it on a USB key.

• Launch the installation by pluging the USB key in an open port. Start the computer and keep the Command key pressed.

Things that worked out of the box:

• wifi
• bluetooth
• keyboard & trackpad
• screen detection

Things not recognized out of the box:

• webcam

Following these instructions got the camera working: https://github.com/patjak/facetimehd/wiki

Things that confuse me:

• Command key on MacOS is used to do copy-paste. Ubuntu uses the Control key. Need to see if I can get used to or do some remapping.