The Raspberry Pi org has released a SD card imager app that is available for Windows, Mac OS, and Ubuntu. I use balenaEtcher on my Macbook Air to create boot SD cards for my Pis, but the new app from the Raspberry Pi org has the benefit of automatically downloading the appropriate source files rather than my having to manually seek them out. These days I pretty much only drag out the Macbook, which is more than seven years old, when I need to flash a new card. I would rather be able to use of my newest computers to flash images, which is why I decided to try to install it on my Pixellbook. Unforutnately, the install failed, which has me wondering whether I should create a new Ubuntu container and try again.