[Bug 1770894] [NEW] Kubuntu 18.04 fails to install from USB

[Steve]

Public bug reported:

Attempting to install Kubuntu 18.04 fresh from a USB (after having a
failed in-place upgrade from 17.10 that destroyed my graphical
environment). Installer throws an error message after setting username,
password, etc. -- " ubi-usersetup failed with exit code 141". Clicked
"Retry" and was able to continue normally. After setting partitions,
installation began; it hanged at 93%, "Restoring previously installed
applications" before throwing an error message indicating that not all
applications could be restored, and that some would need to be manually
reinstalled. Immediately thereafter the installer itself crashed.

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
CurrentDesktop: KDE
Date: Sat May 12 13:05:36 2018
InstallCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz root=UUID=8A52-2251 maybe-ubiquity debian-installer/language=en keyboard-configuration/layoutcode=us iso-scan/filename=/kubuntu-18.04-desktop-amd64.iso boot=casper file=/cdrom/preseed/kubuntu.seed noprompt quiet splash --
LiveMediaBuild: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic kubuntu ubiquity-18.04.14

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https://bugs.launchpad.net/bugs/1770894

Title:
  Kubuntu 18.04 fails to install from USB

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