My system went offline so I rebooted and got this error on the console:

Kernel panic - not syncing: VFS: unable to mount root fs on unknown-block(0,0)

 

Prior to the kernel panic message I also get these lines

/dev/root: can't open blockdev

VFS: can't open root device "(null)" or unknown-block(0,0): error -6

Please append a correct "root=" boot option; Here are the available partitions

and then it lists several partitions

 

I can't attach any diagnostic logs because of no boot.

My system is on version 6.8.3

Edited August 31, 20214 yr by MM23

This is usually a flash drive problem, try recreating it.