[Bug 1849253] [NEW] apt-get install fails when UNRELATED package list is invalid

[seahen]

Public bug reported:

1) Description:	Ubuntu 19.04
Release:	19.04
2) unknown (see below)
3) Even when a package list from one source is invalid, I can still apt-get install and apt-get update packages from other sources, as long as they don't depend on packages in the bad list.
4) I can't install a package from *any* source, even the ones that still yield valid package lists.

On Xubuntu 19.04, I have the following in my sources.list:

deb https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ disco main
deb-src https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ disco main

Currently those sources yield invalid package lists. However,
installation of a package fails even when it comes from *another*
source.

$ sudo apt-get install stress
Reading package lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/adoptopenjdk.jfrog.io_adoptopenjdk_deb_dists_disco_main_binary-amd64_Packages
E: The package lists or status file could not be parsed or opened.

Shouldn't this affect only packages that come from the faulty package
list or depend on ones that do? I get the same error when running

$ apt-cache policy apt-get

so I can't determine what version of apt-get I'm encountering this bug
in.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1849253

Title:
  apt-get install fails when UNRELATED package list is invalid

Status in apt package in Ubuntu:
  New

Bug description:
  1) Description:	Ubuntu 19.04
  Release:	19.04
  2) unknown (see below)
  3) Even when a package list from one source is invalid, I can still apt-get install and apt-get update packages from other sources, as long as they don't depend on packages in the bad list.
  4) I can't install a package from *any* source, even the ones that still yield valid package lists.

  On Xubuntu 19.04, I have the following in my sources.list:

  deb https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ disco main
  deb-src https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ disco main

  Currently those sources yield invalid package lists. However,
  installation of a package fails even when it comes from *another*
  source.

  $ sudo apt-get install stress
  Reading package lists... Error!
  E: Encountered a section with no Package: header
  E: Problem with MergeList /var/lib/apt/lists/adoptopenjdk.jfrog.io_adoptopenjdk_deb_dists_disco_main_binary-amd64_Packages
  E: The package lists or status file could not be parsed or opened.

  Shouldn't this affect only packages that come from the faulty package
  list or depend on ones that do? I get the same error when running

  $ apt-cache policy apt-get

  so I can't determine what version of apt-get I'm encountering this bug
  in.

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