[Bug 2107223] Re: mirror sync in progress, but the situation improves if `rm -fr /var/lib/apt/lists`

[Dan Bungert]

** Tags added: rls-pp-incoming

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Title:
  mirror sync in progress, but the situation improves if `rm -fr
  /var/lib/apt/lists`

Status in apt package in Ubuntu:
  New

Bug description:
  A not-uncommon bug for Subiquity is one that looks like LP: #2105480,
  but we have seen many like it and that's just one example.  In
  summary, some files will fail to download from the mirror with the
  message "Mirror sync in progress?"

  For reasons I don't understand just yet, it seems /var/lib/apt/lists
  can get into a bad state.  `apt-get update` just produces the "Mirror
  sync in progress?".  The way to recover from it is to remove
  /var/lib/apt/lists entirely and start over.  After removing
  /var/lib/apt/lists, `apt-get update` and subsequent operations perform
  as expected.

  I have a live example for you, I don't know if this reproducer
  requires certain mirror state or not.  Attached to this bug is a copy
  of /var/lib/apt/lists, and if you populate your test system
  /var/lib/apt/lists with the contents of this tarball and configure the
  system to hit mirror is.archive.ubuntu.com for series plucky, you may
  see errors like this:

  Err:14 http://is.archive.ubuntu.com/ubuntu plucky/universe amd64 Packages
    404  Not Found [IP: ... 3142]
    File has unexpected size (15764540 != 16133052). Mirror sync in progress? [IP: ... 3142]

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