This bug was fixed in the package ubuntu-release-upgrader - 1:18.04.9

ubuntu-release-upgrader (1:18.04.9) bionic; urgency=medium

  [ Balint Reczey ]
  * Place .keep files in empty directories to keep them when converting the
    repo to git
  * Raise privileges in do-partial-upgrade early with pkexec and apply
    Wayland workaround when needed (LP: #1748509)

  [ Brian Murray ]
  * debian/control: have python3-distupgrade depend on sensible-utils.
    (LP: #1724224)
  * DistUpgrade/ In a couple of spots roll back
    changes made for the upgrade instead of just exiting.

 -- Brian Murray <>  Thu, 22 Feb 2018 13:43:35 -0800

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: In Progress => Fix Released

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  ubiquity crashed with FileNotFoundError in _execute_child(): [Errno 2]
  No such file or directory: 'sensible-browser': 'sensible-browser'

Status in ubiquity package in Ubuntu:
Status in ubuntu-meta package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released

Bug description:
  Test Case
  1. Boot to the live session
  2. Start the installer
  3. Click on the release notes link.

  Expected result
  A webbrowser opens with the release notes

  Actual result
  This crash

  ProblemType: Crash
  DistroRelease: Ubuntu 17.10
  Package: ubiquity 17.10.10
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.387
  Date: Tue Oct 17 11:36:00 2017
  ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
  ExecutableTimestamp: 1507903384
  InterpreterPath: /usr/bin/python3.6
  LiveMediaBuild: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017)
  ProcCmdline: /usr/bin/python3 /usr/lib/ubiquity/bin/ubiquity gtk_ui
  ProcCwd: /home/ubuntu
   PATH=(custom, no user)
  Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 
  PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
  PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 
  SourcePackage: ubiquity
  Title: ubiquity crashed with FileNotFoundError in _execute_child(): [Errno 2] 
No such file or directory: 'sensible-browser': 'sensible-browser'
  UpgradeStatus: No upgrade log present (probably fresh install)

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