[Bug 1891095] Re: update-manager fails silently

[Akbarkhon Variskhanov]

I cannot seem to reproduce this bug. Could you please describe the steps
needed to reproduce it?

Also, did you get notified of updates before that? Does that happen
every time you click on "Upgrade"? What happens before you click on it?

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https://bugs.launchpad.net/bugs/1891095

Title:
  update-manager fails silently

Status in update-manager package in Ubuntu:
  Incomplete

Bug description:
  When I run the "Software Updater" from the menu, and the click
  "Upgrade..." it will fail without any notification.

  If I run it from the terminal, I get the reason why:

  ```
  $ sudo update-manager
  [sudo] password for user: 
  Checking for a new Ubuntu release
  Please install all available updates for your release before upgrading.
  ```

  This is the same error as when I run:

  ```
  $ sudo do-release-upgrade
  Checking for a new Ubuntu release
  Please install all available updates for your release before upgrading.
  ```

  I would expect the GUI should return this error in a dialog box
  instead of just exiting silently.

  ```
  $ lsb_release -rd
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04
  ```

  ```
  $ apt-cache policy update-manager     
  update-manager:
    Installed: 1:18.04.11.13
    Candidate: 1:18.04.11.13
    Version table:
   *** 1:18.04.11.13 500
          500 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
          100 /var/lib/dpkg/status
       1:18.04.11 500
          500 http://ca.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://ca.archive.ubuntu.com/ubuntu bionic/main i386 Packages
  ```

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