I tried following these instructions: https://tutorials.ubuntu.com/tutoria...ick-on-macos#3
However, after using Etcher to write the ISO file to my SD card disk utility started to show the card as being 'not mounted' stopping me from erasing and starting again. After I ejected the card it now comes up as 'not readable' by my computer and no longer shows in Finder. I tried booting my computer to the Startup Manager but the SD card does not come up there either. I'm not sure what I've done or how to fix it.
However, after using Etcher to write the ISO file to my SD card disk utility started to show the card as being 'not mounted' stopping me from erasing and starting again. After I ejected the card it now comes up as 'not readable' by my computer and no longer shows in Finder. I tried booting my computer to the Startup Manager but the SD card does not come up there either. I'm not sure what I've done or how to fix it.