I am trying to manually update from 6.3.5

 

if I try for a clean install I get the following error

end Kernel panic - not syncing: VFS: Unable to mount root FS on unknown block(0,0)  

 

if I create the usb with the backup files I copied of the usb before I started updating and put it in the machine and start it I get the following

Failed to load COM32 file /syslinux/menu.c32

 

What have I done?

That sounds like a problem reading from the USB flash drive.   If you have it in a USB 3 port try moving it to a USB 2 one as they tend to be more reliable.   If it is really failing it will need replacing, and if you go down that route it tends to be better to go for a USB2 drive for reliability as you do not get any performance advantage with UnRAID (since it runs from RAM) going with USB 3.

I have tried all the usb ports on the system and all give the same result. I guess I need to see if I have another flash drive that would work.

I have another unraid server that runs unraid 5. I put the usbs in that machine. they boot right into unraid, both of them no issue. So what kind of hardware issue could the main machine have that would prevent it from booting properly? I have tried different ram, unplugging all the drives.

On 10/26/2018 at 3:44 AM, sublevel4 said:

end Kernel panic - not syncing: VFS: Unable to mount root FS on unknown block(0,0)  

This seems to happen with some hardware, mostly but not limited to servers with AMD CPUs, not sure if anyone found a definitive solution, a different flash drive might help.

I have tried 3 other usb drives with new and from backup. I was able to boot from the usb drives on two other computers but not this one. I was able to boot from a Ununtu live usb  but then all i can see is the pointer. Going to unplug all the drives and go from there. Not really sure where do to go from here.

One more thing worth trying, it worked for me on a computer that wouldn't boot any Unraid releaser newer than 6.2, on the flash drive edit syslinux/syslinux.cfg and add root=sda to the boot option you're using after initrd=/bzroot, e.g.

 

label Unraid OS
  menu default
  kernel /bzimage
  append initrd=/bzroot root=sda