Ubuntu 20.04 crashes each time i try to install on virtualbox

[ralph]

Ubuntu 20.04 crashes each time I try to install on virtualbox. This bug continues even after I have done 2-3 reinstalls of the ubuntu 20.04.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckMismatches: ./casper/filesystem.squashfs ./casper/initrd
CasperMD5CheckResult: fail
CasperVersion: 1.445.1
Date: Tue Sep 1 09:52:08 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Chris Guiver (guiverc)]

Thank you for taking the time to report this issue and helping to make Ubuntu better.

This package failure looks like it was caused by bad ISO download, corrupted install media, or device failure. eg. look in the logs and you'll see messages like these :-

Sep 1 08:15:50 ubuntu kernel: [ 218.797578] SQUASHFS error: zlib decompression failed, data probably corrupt
Sep 1 08:15:50 ubuntu kernel: [ 218.797582] SQUASHFS error: squashfs_read_data failed to read block 0x482dc05e

Examining the information you have given us, this does not appear to be a useful bug report so I am closing it, as it appears to be a bad ISO or faulty device (inc. bad write-to-device). If you believe I'm in error, please leave a comment explaining why and change the status back to 'New'. I suggest you verify your ISO download, and use the 'check disc for defects' option to validate your media before install to ensure a good download & write.

Possibly useful : https://tutorials.ubuntu.com/tutorial/tutorial-how-to-verify-ubuntu#0

Your pre-run scan reports FAIL; this is a result of the problem the integrity check detected.

[Chris Guiver (guiverc)]

FYI: If you allocated to little ram to your VM, this error can occur with virtualbox.