Public bug reported:

Tried to install Ubuntu
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.5 LTS"

trough PXE boot and NFS:

label install2
menu label ^Install XUbuntu 18.04 Desktop NFS
menue default
kernel ubuntu1804/vmlinuz
append initrd=ubuntu1804/initrd boot=casper netboot=nfs 
nfsroot=192.168.200.1:/var/lib/nfs/ubuntu1804/desktop  ide=nodma acpi=off

(also tied w and w/o ide=nodema and/or acpi=of)

PXE Server:
  VM Xubuntu 18.04.5 LTS
  Network bridged 

Client:
  VM should become Ubuntu 10.04.5 LTS :(
  Network bridged 

Hypervisor:
  both VMs run as virtualbox VM
  Virtualbox version 6.1.16

Host:
  Ubuntu 20.04.1 LTS


I get the Desktop and start "Ubuntu 18.04.5LTS Installation", select keyboard, 
location and clear disk completely .... and start.
The disk is going to be parted and mounted, the file copy starts succcessfully.
Ca. after 75-80% progress the copy process stops with a error message regarding 
read from CD/DVD  issues.

/var/log/syslog:
...
Jan  7 16:57:52 ubuntu kernel: [   20.708387] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 16:57:52 ubuntu kernel: [   20.708390] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 16:57:52 ubuntu kernel: [   21.196785] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 16:57:52 ubuntu kernel: [   21.196788] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 16:57:52 ubuntu kernel: [   21.242897] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 16:57:52 ubuntu kernel: [   21.242900] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:00:17 ubuntu kernel: [  167.312732] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:00:17 ubuntu kernel: [  167.312735] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:00:17 ubuntu kernel: [  167.313302] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:00:17 ubuntu kernel: [  167.313303] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:02:51 ubuntu kernel: [  321.324247] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:02:51 ubuntu kernel: [  321.324250] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:02:51 ubuntu kernel: [  321.332684] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:02:51 ubuntu kernel: [  321.332686] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:07:48 ubuntu kernel: [  618.016118] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:07:48 ubuntu kernel: [  618.016121] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:07:48 ubuntu kernel: [  618.024472] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:07:48 ubuntu kernel: [  618.024474] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:12:48 ubuntu kernel: [  917.992441] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:12:48 ubuntu kernel: [  917.992444] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30
Jan  7 17:12:48 ubuntu kernel: [  918.000828] SQUASHFS error: zlib 
decompression failed, data probably corrupt
Jan  7 17:12:48 ubuntu kernel: [  918.000830] SQUASHFS error: 
squashfs_read_data failed to read block 0x64f2bd30

....

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.15
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CasperVersion: 1.394.3
Date: Thu Jan  7 18:00:32 2021
InstallCmdLine: BOOT_IMAGE=ubuntu1804/vmlinuz initrd=ubuntu1804/initrd 
boot=casper netboot=nfs nfsroot=192.168.200.1:/var/lib/nfs/ubuntu1804/desktop  
ide=nodma acpi=off debian-installer/language=de console-setup/layoutcode?=de --
LiveMediaBuild: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic ubiquity-18.04.14.15

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https://bugs.launchpad.net/bugs/1910568

Title:
  Ubuntu 18.04 Desktop installation through nfs fails during copying
  files with SQASHFS errors

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