Complete reinstall from cd over bad upgrade failed

[Gerry Smith]

Having waited until 08Aug18 to upgrade from 16.04LTS to 18.04LTS I forced an upgrade. There were a lot of errors which seemed to result from network interface not working and so no contact with mirror (at ox.ac.uk). I therefore tried a fresh install from DVD (which I had already used for installation of 18.04LTS on an old laptop some weeks ago) This install has also failed.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Thu Aug 9 15:03:40 2018
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)