[Bug 1153569] Re: "Failed to download repository information" alert is unattractive

[Karim BAKKAL]

Same issue on xUbuntu 20.04.

Message box describe an connection issue in place of the right issue, in
my case it was a wrong public key issue.

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https://bugs.launchpad.net/bugs/1153569

Title:
  "Failed to download repository information" alert is unattractive

Status in update-manager package in Ubuntu:
  Triaged

Bug description:
  update-manager 1:0.174.4, Ubuntu 12.10

  In some situations (e.g. bug 888845, bug 1097073), a "Failed to
  download repository information" alert appears.

  This alert is unattractive in several ways:
  a. it is maximizable
  b. the title is "update-manager", all lower-case
  c. the primary text is not a complete sentence
  d. it uses the word "repository"
  e. the secondary text is "Check your Internet connection", when that usually is not the problem
  f. it has a "Close" button.

  <https://wiki.ubuntu.com/SoftwareUpdates#check-interactive>: "If the
  check fails because of an error, the progress window should morph into
  an error alert, with the title 'Software Updater' and primary text
  depending on the exact situation ... 'The check for updates couldn’t
  complete because not all software channels are available.'"

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