[Bug 1840548] [NEW] Installer hangs on iMac Pro (2017)

[Raffaele Candeliere]

Public bug reported:

Hi, 
I'm trying to install Ubuntu on an iMac Pro (2017) using the latest desktop ISO (ubuntu-19.04-desktop-amd64.iso) but the installer hangs very early.

Steps to reproduce

1) Burn the ISO to a DVD or USB stick

2) From the system (EFI) OS chooser select the CD or USB device with the
Ubuntu distribution. The GRUB screen correctly pops up.

3) Select "Install Ubuntu" (or "Try Ubuntu", or "Install Ubuntu (Safe
graphics)", or "Try Ubuntu (Safe graphics)", the result is always the
same) and hit the Enter Key

Expected behavior: The installation process should start

Actual behavior: The screen goes fully blank and the system freezes

Since the system hangs so early, I'm not sure the culprit is Ubiquity or
the kernel

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1840548

Title:
  Installer hangs on iMac Pro (2017)

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Hi, 
  I'm trying to install Ubuntu on an iMac Pro (2017) using the latest desktop ISO (ubuntu-19.04-desktop-amd64.iso) but the installer hangs very early.

  Steps to reproduce

  1) Burn the ISO to a DVD or USB stick

  2) From the system (EFI) OS chooser select the CD or USB device with
  the Ubuntu distribution. The GRUB screen correctly pops up.

  3) Select "Install Ubuntu" (or "Try Ubuntu", or "Install Ubuntu (Safe
  graphics)", or "Try Ubuntu (Safe graphics)", the result is always the
  same) and hit the Enter Key

  Expected behavior: The installation process should start

  Actual behavior: The screen goes fully blank and the system freezes

  Since the system hangs so early, I'm not sure the culprit is Ubiquity
  or the kernel

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