[Bug 1567462] Re: Identical mount points for two file systems error

[Gail]

I got exactly the same problem - ubiquity crash - at the same step - trying to re-install Ubuntu 18.04.1.
   Two file systems are assigned the same mount point (/boot/efi)...
   Please correct this by changing mount points

If I click OK I'm taken to the partition editor which appears to scan my
drives but then doesn't show any data. If I click on the "next" button,
ubiquity then crashes.

Ubiquity 18.04.14.6
"Ubiquity crashed with AttributeError in ok_handler(): 'NoneType' object has no attribute 'endswith' "
Casper version 1.394
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18

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https://bugs.launchpad.net/bugs/1567462

Title:
  Identical mount points for two file systems error

Status in ubiquity package in Ubuntu:
  Expired

Bug description:
  When attempting to install 16.04 Beta 2 by upgrading 15.10, I get the
  following error:

  Identical mount points for two file systems

  Two file systems are assigned the same mount point (/boot/efi): SCSI1
  (0,0,0), partition #2 (sda) and SCSI5 (0,0,0), partition #1 (sdb).

  Please correct this by changing mount points.

  
  If I click OK I'm taken to the partition editor which appears to scan my drives but then doesn't show any particles. If I click on any partition editing buttons, ubiquity then crashes.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity 2.21.51 [modified: lib/partman/automatically_partition/question]
  ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
  Uname: Linux 4.4.0-15-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.368
  CurrentDesktop: Unity
  Date: Thu Apr  7 13:52:09 2016
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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