Installation fails with input/output errno5

[Giovanni Luciardello]

The ubuntu-18.04.2-desktop-amd64.iso maybe corrupted.

This is the md5sum -c MD5SUMS | grep ubuntu-18.04.2-desktop-amd64.iso output:

md5sum: ubuntu-18.04.2-live-server-amd64.iso: No such file or directory
md5sum: WARNING: 1 listed file could not be read

I downloaded the ISO image more time from official mirror.

When I try to install Ubuntu, I get two errors:
 a busybox (core dump) e the crash of the intaller with errno5

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.12
ProcVersionSignature: Ubuntu 4.18.0-15.16~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CasperVersion: 1.394
Date: Wed Jul 31 09:14:38 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Paul White (paulw2u)]

We are sorry that we do not always have the capacity to review all reported bugs in a timely manner.

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

Jul 31 07:10:29 ubuntu kernel: [ 3444.340925] SQUASHFS error: zlib decompression failed, data probably corrupt
Jul 31 07:10:29 ubuntu kernel: [ 3444.340933] SQUASHFS error: squashfs_read_data failed to read block 0x36a43c

It's possible you had a bad write to your media or for some other reason its contents could not be read. Whenever you have such a problem 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 and/or re-downloading it.