[Bug 1721486] [NEW] lunubu can't upgrade from 16.04 to 17.04. sudo do-release-upgrade encountered weird error

[kngharv]

Public bug reported:

trying to upgrade from do-release-upgrade, and encountered error.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.22
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: LXDE
Date: Thu Oct  5 16:53:41 2017
InstallationDate: Installed on 2016-09-12 (387 days ago)
InstallationMedia: Lubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2017-10-05 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2017-10-05T16:42:18.535388

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade xenial

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https://bugs.launchpad.net/bugs/1721486

Title:
  lunubu can't upgrade from 16.04 to 17.04.  sudo do-release-upgrade
  encountered weird error

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  trying to upgrade from do-release-upgrade, and encountered error.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.22
  ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
  Uname: Linux 4.4.0-97-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Thu Oct  5 16:53:41 2017
  InstallationDate: Installed on 2016-09-12 (387 days ago)
  InstallationMedia: Lubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2017-10-05 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2017-10-05T16:42:18.535388

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