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! [Ubuntu 18.04 not booting properly Showing [3.244726 AMD -vi Unable to write to IOMMU perf counter 3.365182. Could not get size 0×80000000000000e 3. 367212 MODSIGN : couldn't get UFEI db list 3. 6894l3 couldn't get size O×80000000000000e

Amd GPU ERROR -boot args (cat/proc/cmdline)

Missing modules (cat/proc/modules: is/Dev)

ALERT ! UUID =30cad26-e3b8-bd9c-b6dd5932d6d6 does not exist. Dropping to a shell .

Busybox v 1.27.2 Ubuntu built in shell (ash) Enter help

(Initramfs)_ ]

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It look like the UUID of the root partition is wrong or hash changed for some reason. So you need to fix/update to the proper UUID.

This can be done by booting into a Ubuntu Live-CD and open a konsole and type in the following commands:

$ sudo blkid
/dev/sdb1: UUID="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" UUID_SUB="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" TYPE="btrfs" PARTUUID="xxxxxxxx-xx"
/dev/sda1: UUID="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" UUID_SUB="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" TYPE="btrfs" PARTUUID="xxxxxxxx-xx"

The output of the command might be a bit different according to your disk partion tabe. In most cases the /dev/sda1 is the root filesystem. So you need to mount the partition in the running live system and change UUID in the /etc/fstab file

$ sudo mount /dev/sda1 /mnt
$ editor /mnt/etc/fstab

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system>                           <mount point> <type>  <options> <dump>  <pass>
# / was on /dev/sda1 during installation
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx /             btrfs   defaults  0       0

The filesytem type and might be differnt in your case. If /dev/sda1 does not contain the /etc/fstab, then you have the wrong partition. umount /mnt and try the other partitions.

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