[Bug 1880368] [NEW] do-release-upgrade doesn't always open a window

[Emersion]

Public bug reported:

1. Open the update manager
2. Click "Upgrade"
3. do-release-upgrade is launched but exits immediately without showing any window

What happened is that do-release-upgrade prints an error message to the
console. However the message is not displayed in a window. For end-users
this is very surprising.

Instead, do-release-upgrade should always print error messages in a GTK
window.

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

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https://bugs.launchpad.net/bugs/1880368

Title:
  do-release-upgrade doesn't always open a window

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

Bug description:
  1. Open the update manager
  2. Click "Upgrade"
  3. do-release-upgrade is launched but exits immediately without showing any window

  What happened is that do-release-upgrade prints an error message to
  the console. However the message is not displayed in a window. For
  end-users this is very surprising.

  Instead, do-release-upgrade should always print error messages in a
  GTK window.

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