[Bug 1910841] Re: upgrader should notify user if all pockets are disabled due not having a release file

[pleabargain]

Just tried upgrading to latest ubuntu from 20.10 to 21.04
install dies with no message
I tried US server = no joy
I tried main server = no joy

see upgrade fail with no message gif

** Attachment added: "upgrade fail with no message"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1910841/+attachment/5496857/+files/upgrade%20fail%20Peek%202021-05-13%2007-54.gif

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https://bugs.launchpad.net/bugs/1910841

Title:
  upgrader should notify user if all pockets are disabled due not having
  a release file

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Impish:
  Triaged

Bug description:
  test case: if upgrade does not commence tell user to check mirror

  
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1901797/comments/4

  The installer should not DIE without telling the user why.

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