Install Lubuntu as 2nd Linux OS - installer crash

[Sven Meyer]

1) tried to install lubuntu into existing partition, using another existing ext4 partition as home
... a few screen further down (while entering account detail) installed crashed with message : could not write to HD ... although I had a working linux install on that partition for months

2) as above. but deleted install partition and re-created right thereafter ... same crash bahaviour

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: Sat Oct 24 22:43:15 2020
InstallCmdLine: file=/cdrom/preseed/lubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd quiet splash ---
LiveMediaBuild: Lubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
ProcEnviron:
 LANGUAGE=en_AU.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 LC_NUMERIC=C.UTF-8
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 :-

Oct 24 11:42:55 lubuntu kernel: [ 267.425966] SQUASHFS error: zlib decompression failed, data probably corrupt
Oct 24 11:42:55 lubuntu kernel: [ 267.425974] SQUASHFS error: squashfs_read_data failed to read block 0x24fec17

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 and https://help.ubuntu.com/community/Installation/CDIntegrityCheck (where CD refers to your install media, be it CD, DVD, HDD, SSD, thumb-drive etc)