Public bug reported:

Issue found on ARM64 node ms10-35-mcdivittb0-kernel with F-5.8.
Install the plymouth package from proposed will cause system failed to boot, 
with error message:
  Wrong Ramdisk Image Format
  Ramdisk image is corrupt or invalid

It's 100% reproducible.

Steps to reproduce this:
1. Deploy Focal on this node (Architecture set to arm64/xgene-uboot, it can't 
be deployed if set to arm64/generic, PXE boot failed with TFTP error: 'File not 
found' (1))
2. Enable proposed pocket.
3. Install the linux-generic-hwe-20.04-edge and reboot
4. It's now running with 5.8.0-25-generic on Focal
5. Install plymouth from proposed and reboot

In step 5 it will generate the new boot image.

$ sudo apt install plymouth
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  plymouth-theme-ubuntu-text
Suggested packages:
  desktop-base plymouth-themes
The following packages will be upgraded:
  plymouth plymouth-theme-ubuntu-text
2 upgraded, 0 newly installed, 0 to remove and 18 not upgraded.
Need to get 121 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://ports.ubuntu.com/ubuntu-ports focal-proposed/main arm64 
plymouth-theme-ubuntu-text arm64 0.9.4git20200323-0ubuntu6.1 [9148 B]
Get:2 http://ports.ubuntu.com/ubuntu-ports focal-proposed/main arm64 plymouth 
arm64 0.9.4git20200323-0ubuntu6.1 [112 kB]
Fetched 121 kB in 0s (326 kB/s)  
(Reading database ... 112559 files and directories currently installed.)
Preparing to unpack 
.../plymouth-theme-ubuntu-text_0.9.4git20200323-0ubuntu6.1_arm64.deb ...
Unpacking plymouth-theme-ubuntu-text (0.9.4git20200323-0ubuntu6.1) over 
(0.9.4git20200323-0ubuntu6) ...
Preparing to unpack .../plymouth_0.9.4git20200323-0ubuntu6.1_arm64.deb ...
Unpacking plymouth (0.9.4git20200323-0ubuntu6.1) over 
(0.9.4git20200323-0ubuntu6) ...
Setting up plymouth (0.9.4git20200323-0ubuntu6.1) ...
update-initramfs: deferring update (trigger activated)
update-rc.d: warning: start and stop actions are no longer supported; falling 
back to defaults
update-rc.d: warning: start and stop actions are no longer supported; falling 
back to defaults
Setting up plymouth-theme-ubuntu-text (0.9.4git20200323-0ubuntu6.1) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for systemd (245.4-4ubuntu3.2) ...
Processing triggers for initramfs-tools (0.136ubuntu6.3) ...
update-initramfs: Generating /boot/initrd.img-5.8.0-25-generic
flash-kernel: installing version 5.8.0-25-generic
Generating kernel u-boot image... done.
Taking backup of uImage.
Installing new uImage.
Generating initramfs u-boot image... done.
Taking backup of uInitrd.
Installing new uInitrd.
Generating boot script u-boot image... done.
Taking backup of boot.scr.
Installing new boot.scr.

>From the console you will see:
[  OK  ] Finished Reboot.
[  OK  ] Reached target Reboot.
[  290.396974] pci_bus 0000:01: 2-byte config write to 0000:01:00.0 offset 0x4 
may corrupt adjacent RW1C bits
[  290.512964] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x5c 
may corrupt adjacent RW1C bits
[  290.629960] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x48 
may corrupt adjacent RW1C bits
[  290.746976] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x4 
may corrupt adjacent RW1C bits
[  290.863165] reboot: Restarting system


U-Boot 2013.04 (Mar 26 2015 - 11:31:01)

ProLiant m400 Server Cartridge - U02 (02/26/2015)
Copyright 2013 - 2015 Hewlett-Packard Development Company, L.P. 
Copyright 2000 - 2012 Wolfgang Denk, DENX Software Engineering, w...@denx.de


CPU0: APM ARM 64-bit Potenza Rev B0 2400MHz PCP 2400MHz
     32 KB ICACHE, 32 KB DCACHE
     SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz
Boot from SPI-NOR
Slimpro FW: Ver: 2.3 (build 2015/03/16)
        PMD: 960 mV
        SOC: 950 mV
I2C:   ready
DRAM:  ECC 64 GiB @ 1333MHz     
relocation Address is: 0x4ffff27000
Using default environment

API sig @ 0x0000004ffdf17170
In:    serial
Out:   serial
Err:   serial
CPUs:  11111111
CPLD: 0B
PCIE3: (RC) X8 GEN-2 link up
  00:00.0     - 19aa:e008 - Bridge device
   01:00.0    - 15b3:1007 - Network controller
SF: Detected MX25L12805D with page size 64 KiB, total 16 MiB
SF: 16384 KiB MX25L12805D at 0:0 is now current device

SF: flash read success (19048 bytes @ 0xe0000)
.
SF: flash read success (65568 bytes @ 0xc0000)
Node Boot Start Time: 2020-10-21T05:29:01
Node Serial Number: CN7505VJ4B
Cartridge Chassis Slot ID: 35
Cartridge Serial Number: CN7505VJ4B
Chassis Serial Number: USE42207F7
Chassis Asset Tag: 
Node UUID: 9A026903-E1ED-5E39-9768-ED1FB68A9301
Product ID: 721717-B21
Timezone Name: America/New_York
SCSI:  Target spinup took 0 ms.
AHCI2 0001.0300 32 slots 2 ports 6 Gbps 0x3 impl SATA mode
flags: 64bit ncq pm only pmp fbss pio slum part ccc 
scanning bus for devices...
  Device 0: (4:0) Vendor: ATA      Prod.: XR0240GEBLU Rev: HPS4
            Type: Hard Disk
            Capacity: 228936.5 MB = 223.5 GB (468862128 x 512)
Found 1 device(s).
Boot: PXE, M.2
Mellanox ConnectX3 U-Boot driver version 1.1
Mellanox ConnectX3 Firmware Version 2.32.5330
Net:   NIC1 [PRIME], NIC2

Booting PXE
Requesting DHCP address via NIC1
BOOTP broadcast 1
DHCP client bound to address 10.229.65.135
Retrieving file: pxelinux.cfg/9A026903-E1ED-5E39-9768-ED1FB68A9301
Using NIC1 device
TFTP from server 10.229.32.21; our IP address is 10.229.65.135
Filename 'pxelinux.cfg/9A026903-E1ED-5E39-9768-ED1FB68A9301'.
Load address: 0x4000800000
Loading: *
TFTP error: 'File not found' (1)
Not retrying...
Retrieving file: pxelinux.cfg/01-14-58-d0-58-c3-c2
Using NIC1 device
TFTP from server 10.229.32.21; our IP address is 10.229.65.135
Filename 'pxelinux.cfg/01-14-58-d0-58-c3-c2'.
Load address: 0x4000800000
Loading: #
         0 Bytes/s
done
Bytes transferred = 41 (29 hex)
Config file found
1:      local
PXE: executing localboot
288 bytes read in 34 ms (7.8 KiB/s)
## Executing script at 4004000000
11349894 bytes read in 312 ms (34.7 MiB/s)
invalid extent block
## Booting kernel from Legacy Image at 4002000000 ...
   Image Name:   kernel 5.8.0-25-generic
   Created:      2020-10-21   5:26:34 UTC
   Image Type:   ARM Linux Kernel Image (gzip compressed)
   Data Size:    11349830 Bytes = 10.8 MiB
   Load Address: 00080000
   Entry Point:  00080000
   Verifying Checksum ... OK
Wrong Ramdisk Image Format
Ramdisk image is corrupt or invalid
Booting M.2

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: plymouth 0.9.4git20200323-0ubuntu6.1
ProcVersionSignature: Ubuntu 5.8.0-25.26~20.04.1-generic 5.8.14
Uname: Linux 5.8.0-25-generic aarch64
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: arm64
BootLog: Error: [Errno 2] No such file or directory: '/var/log/boot.log'
CasperMD5CheckResult: skip
Date: Wed Oct 21 05:27:35 2020
Lspci-vt: -[0000:00]---00.0-[01]----00.0  Mellanox Technologies MT27520 Family 
[ConnectX-3 Pro]
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Lsusb-t:
 
Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
ProcCmdLine: console=ttyS0,9600n8r ro
ProcFB:
 
ProcKernelCmdLine: console=ttyS0,9600n8r ro
SourcePackage: plymouth
TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
UpgradeStatus: No upgrade log present (probably fresh install)
acpidump:

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: plymouth (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug arm64 focal package-from-proposed uec-images

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https://bugs.launchpad.net/bugs/1900796

Title:
  plymouth in proposed cause F-5.8 unable to boot on moonshot ARM64
  "Wrong Ramdisk Image Format"

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