[Bug 1657440] Re: apt won't redownload Release.gpg after inconsistent cache updates made while UCA is being updated

[Vej]

** Bug watch added: Debian Bug tracker #838779
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838779

** Also affects: apt via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838779
   Importance: Unknown
       Status: Unknown

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Title:
  apt won't redownload Release.gpg after inconsistent cache updates made
  while UCA is being updated

Status in APT:
  Unknown
Status in apt package in Ubuntu:
  Confirmed

Bug description:
  # apt --version
  apt 1.2.18 (amd64)

  xenial

  
  I got myself into a situation where a repository has a Release and a Release.gpg file, but apt is just ignoring the gpg one and won't download it via apt update for some reason:

  The repository in question is http://ubuntu-
  cloud.archive.canonical.com/ubuntu/dists/xenial-updates/newton/. See
  how locally I have just the Release file:

  root at juju-cb14ed-0-lxd-3:/var/lib/apt/lists# l *Release*
  -rw-r--r-- 1 root root 100K Jan 15 18:03 archive.ubuntu.com_ubuntu_dists_xenial-backports_InRelease
  -rw-r--r-- 1 root root 242K Apr 21  2016 archive.ubuntu.com_ubuntu_dists_xenial_InRelease
  -rw-r--r-- 1 root root 100K Jan 18 11:42 archive.ubuntu.com_ubuntu_dists_xenial-updates_InRelease
  -rw-r--r-- 1 root root 100K Jan 18 11:42 security.ubuntu.com_ubuntu_dists_xenial-security_InRelease
  -rw-r--r-- 1 root root 7.7K Jan 18 11:45 ubuntu-cloud.archive.canonical.com_ubuntu_dists_xenial-updates_newton_Release

  
  Now I try an update. See how the Release.gpg file gets a "Hit:" instead of a "Get:":
  root at juju-cb14ed-0-lxd-3:/var/lib/apt/lists# apt update
  Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
  Hit:2 http://archive.ubuntu.com/ubuntu xenial InRelease                        
  Ign:3 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/newton InRelease
  Get:4 http://archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
  Hit:5 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/newton Release
  Get:6 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/newton Release.gpg [543 B]
  Hit:7 http://archive.ubuntu.com/ubuntu xenial-backports InRelease
  Fetched 205 kB in 0s (395 kB/s)                   
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  8 packages can be upgraded. Run 'apt list --upgradable' to see them.

  
  And I can't install packages:
  root at juju-cb14ed-0-lxd-3:/var/lib/apt/lists# apt dist-upgrade
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  The following NEW packages will be installed:
    python3-setuptools
  The following packages will be upgraded:
    dh-python dnsmasq-base python-pkg-resources python-setuptools python3-cryptography python3-pkg-resources python3-requests python3-urllib3
  8 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
  Need to get 1,193 kB of archives.
  After this operation, 808 kB of additional disk space will be used.
  Do you want to continue? [Y/n] 
  WARNING: The following packages cannot be authenticated!
    dh-python dnsmasq-base python-setuptools python-pkg-resources python3-pkg-resources python3-setuptools python3-cryptography python3-requests python3-urllib3
  Install these packages without verification? [y/N] n
  E: Some packages could not be authenticated
  root at juju-cb14ed-0-lxd-3:/var/lib/apt/lists# 

  Somehow apt is thinking it has the Release.gpg file, but it doesn't?

  
  This server is behind a squid proxy.

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