[Bug 1880369] [NEW] Please install all available updates

[Emersion]

Public bug reported:

1. Open update manager
2. Update manager prompts for regular updates, perform them
3. Update manager now prompts for dist upgrade, click "Upgrade"
4. do-release-upgrade is launched
5. Error message is printed: "Please install all available updates for your release before upgrading"

However, doing `sudo apt update && sudo apt upgrade` isn't enough. In
fact, `sudo apt upgrade` says an upgrade for libc++1 is available but
won't be installed. Manually installing libc++1 un-breaks do-release-
upgrade.

do-release-upgrade shouldn't block on such "update available but won't
be upgraded" packages.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1880369

Title:
  Please install all available updates

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

Bug description:
  1. Open update manager
  2. Update manager prompts for regular updates, perform them
  3. Update manager now prompts for dist upgrade, click "Upgrade"
  4. do-release-upgrade is launched
  5. Error message is printed: "Please install all available updates for your release before upgrading"

  However, doing `sudo apt update && sudo apt upgrade` isn't enough. In
  fact, `sudo apt upgrade` says an upgrade for libc++1 is available but
  won't be installed. Manually installing libc++1 un-breaks do-release-
  upgrade.

  do-release-upgrade shouldn't block on such "update available but won't
  be upgraded" packages.

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