[Bug 1790350] Re: Software updater failing to download some necessary updates

[Sleepy John]

Here are the reported details (which I struggle to understand) after
witnessing several minutes of apparently successful cache updates:

W:GPG error: http://ftp.hk.debian.org/debian stretch Release: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY 8B48AD6246925553  NO_PUBKEY 7638D0442B90D010
NO_PUBKEY EF0F382A1A7B6500, W:The repository
'http://ftp.hk.debian.org/debian stretch Release' is not signed., W:Data
from such a repository can't be authenticated and is therefore
potentially dangerous to use., W:See apt-secure(8) manpage for
repository creation and user configuration details., E:Failed to fetch
http://ftp.hk.debian.org/debian/dists/stretch/main/i18n/Translation-en
Could not open file /var/lib/apt/lists/partial/ftp.hk.debian
.org_debian_dists_stretch_main_i18n_Translation-en.bz2 - open (13:
Permission denied), E:Some index files failed to download. They have
been ignored, or old ones used instead.

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https://bugs.launchpad.net/bugs/1790350

Title:
  Software updater failing to download some necessary updates

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

Bug description:
  This problem occurred when trying to invoke software updater to resume
  regular updating after months of failing to update

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-33.36~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-33-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Sep  2 09:58:21 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-11-08 (297 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeTermlog:

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