[kwlug-disc] Server does not boot after kernel upgrade

[Doug Moen]

Ubuntu upgrades make me very nervous, so I still haven't upgraded from
16.04 to 18.04.
Did you do an "upgrade" upgrade, or did you back up your files and do a
bare metal install?

On Tue, Jan 29, 2019, at 1:15 PM, Khalid Baheyeldin wrote:
> Over the weekend, I upgraded my home server from Ubuntu 16.04 LTS
> to 18.04.> This is a bare metal machine, with a SATA disk.
> 
> I rebooted it then, and all worked well.
> 
> Then a kernel update came along today, so I applied it and rebooted.
> 
> Now, that server does not boot, with this kernel panic:
> 
> "Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-
> block(0,0)"> Followed by a stack trace.
> 
> Searching around the recommended remedy is this, from a bootable DVD:> 
> # mount /dev/sda1 /mnt
> # mount --bind /dev /mnt/dev
> # mount --bind /dev/pts /mnt/dev/pts
> # mount --bind /proc /mnt/proc
> # mount --bind /sys /mnt/sys
> # chroot /mnt
> # update-initramfs -u -k 4.15.0-44-generic
> # update-grub2
> 
> The output from the last command is:
> 
> # update-grub2 
> Generating grub configuration file ...
> Found linux image: /boot/vmlinuz-4.15.0-44-generic
> Found initrd image: /boot/initrd.img-4.15.0-44-generic
> Found linux image: /boot/vmlinuz-4.15.0-43-generic
> Found initrd image: /boot/initrd.img-4.15.0-43-generic
> Found memtest86+ image: /boot/memtest86+.elf
> Found memtest86+ image: /boot/memtest86+.bin
>   WARNING: Failed to connect to lvmetad. Falling back to device
>   scanning.> done
> 
> Note the warning, but I am not using LVM.
> 
> Still, I get the same panic error upon reboot. 
> 
> Using the grub menu when booting, the previous kernel version
> works fine.> 
> Also, the /boot directory is not a separate partition, so it has all
> the space it needs.> 
> Any one else got a borked system after today's kernel upgrade?
> -- 
> Khalid M. Baheyeldin
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