[Bug 1888054] Re: I received the following error when trying to move to Ubuntu 20.04: ERROR:nacl_helper_linux.cc(308)] NaCl helper process running without a sandbox!

[Brian Murray]

There was an error communicating with the mirror of the Ubuntu archive
which you use and that cause the upgrade calculation to fail. Please try
manually connecting to the mirror and if that works try the upgrade
again. Otherwise if that fails try switching mirrors or investigating
your network connection.

2020-07-18 07:05:17,151 DEBUG examining: 'deb http://mirror.atlantic.net/ubuntu/ bionic main restricted'
2020-07-18 07:05:17,152 DEBUG verifySourcesListEntry: deb http://mirror.atlantic.net/ubuntu/ focal main restricted
2020-07-18 07:05:17,152 DEBUG url_downloadable: http://mirror.atlantic.net/ubuntu//dists/focal/Release
2020-07-18 07:05:17,152 DEBUG s='http' n='mirror.atlantic.net' p='/ubuntu//dists/focal/Release' q='' f=''
2020-07-18 07:05:17,370 DEBUG error from httplib: 'HTTP Error 404: Not Found'

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1888054

Title:
  I received the following error when trying to move to Ubuntu 20.04:
  ERROR:nacl_helper_linux.cc(308)] NaCl helper process running without a
  sandbox!

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

Bug description:
  lsb_release -rd
  Description:	Ubuntu 18.04.3 LTS
  Release:	18.04

  apt-cache policy pkgname
  N: No se ha podido localizar el paquete pkgname

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.34
  ProcVersionSignature: Ubuntu 4.15.0-64.73-generic 4.15.18
  Uname: Linux 4.15.0-64-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia wl
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Jul 18 07:05:27 2020
  InstallationDate: Installed on 2015-10-01 (1752 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-07-18 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-07-18 07:04:15.789005
   Log time: 2020-07-18 07:04:57.922928
   Log time: 2020-07-18 07:05:27.154966
   Log time: 2020-07-18 07:05:29.528909

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