[Bug 1891095] Re: update-manager fails silently

[Akbarkhon Variskhanov]

Are you offered to install some updated software? Because on my end, Software Updater is offering me to install updated software first. There is nothing about upgrades. As soon as it's done updating, a new window appears notifying me of Ubuntu 20.04 LTS. It has three buttons: 
<Settings>    <Upgrade...>  <OK>

1. If there is updated software available, Software Updated pops up.
2. Then it checks for upgrades.

If you run sudo apt update in Terminal, what do you see? Are you offered
to update some packages? If yes then everything is working as intended.

** Attachment added: "software-updater.png"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1891095/+attachment/5401567/+files/software-updater.png

** Changed in: update-manager (Ubuntu)
       Status: New => Incomplete

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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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