installation program detects a disk problem and stops

[John]

unable to add extra info

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.12
ProcVersionSignature: Ubuntu 5.0.0-23.24~18.04.1-generic 5.0.15
Uname: Linux 5.0.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CasperVersion: 1.394
Date: Tue Nov 19 19:18:15 2019
InstallCmdLine: file=/cdrom/preseed/xubuntu.seed boot=casper persistent initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Xubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
ProcEnviron:
 LANGUAGE=nl_NL.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=nl_NL.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Paul White (paulw2u)]

The following messages can be found in UbiquitySyslog.txt which was automatically attached to this bug report:

Nov 19 16:30:23 xubuntu kernel: [ 631.354041] SQUASHFS error: zlib decompression failed, data probably corrupt
Nov 19 16:30:23 xubuntu kernel: [ 631.354050] SQUASHFS error: squashfs_read_data failed to read block 0x597f8d5

You probably had a bad write to your media. If you're still having problems please try the option to check the integrity of the image from the installer boot menu, and if this confirms that the media is corrupt, try re-writing it. Due to the time that has elapsed since you raised this report I'm closing it but please feel free to re-open it if you're still unable to complete the installation.