There are several reports in forums e.g. https://www.raspberrypi.org/forums/viewtopic.php?f=56&t=178073 https://ubuntu-mate.community/t/raspberry-boot/12065
There are several reports in forums e.g. https:/ /www.raspberryp i.org/forums/ viewtopic. php?f=56& t=178073 https:/ /ubuntu- mate.community/ t/raspberry- boot/12065