I have a Raspberry Pi 3B, a 32GB SanDisk Extreme 32GB microSD A1 U3 V30 UHS-I bought from a SanDisk- licensed distributor. I've loaded Raspbian 2020-05-27-raspios-buster-full-armhf.img onto it. I went through the normal boot process, which involves one iteration of the Pi re-sizing the partitions, rebooting, enabling SSH, rebooting, loading lots of software, for a total of 13 reboots before getting to the RPi Desktop. At some point, it ran an update, and rebooted. From then on, I get the message:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
I ran fsck (from Ubuntu) on both the partitions, and found no errors on either the boot or rootfs partitions.
% sudo fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 29.74 GiB, 31914983424 bytes, 62333952 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0xf8600252 Device Boot Start End Sectors Size Id Type /dev/mmcblk0p1 8192 532479 524288 256M c W95 FAT32 (LBA) /dev/mmcblk0p2 532480 62333951 61801472 29.5G 83 Linux
What the info would be helpful?