Public bug reported:

While performing testcase: "Install (manual partitioning) in Ubuntu Desktop 
amd64 in Bionic Daily"
the installer Freezes when clicking the "Install Now" button which is step #8 
of this testcase.

Test Machine:

iMac (Retina 5K, 27-inch, Late 2015)
Model Number A1419
CPU: 8 x Intel Core i7-6700K @ 4.00 GHz
SSD 1TB
Memory: 24G
Graphics: Radeon M395X
Intel Sunrise Point-H HD Audio

...
Link to Screenshots:
https://bionicmac.club/index.php/s/kIVdjxRYOauMFYq
...

This happened 3 times in a row to verify.

I made sure the iso was not corrupt, re-flashed the usb key and it
continues to be an issue.

Exactly after I click "Install Now" button the ubiquity gui goes corrupt as if 
it
is a graphics issue but the rest of the desktop looks fine. It is only the 
ubiquity
gui window that gets the rainbow/static video garbled.

That garbled ubiquity wondow only stays for 10-15 seconds then goes
away. Then the screens in the link above come up confirming an issue.

This leaves me unable to complete the installation.

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


** Tags: iso-testing

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https://bugs.launchpad.net/bugs/1767073

Title:
  Bionic Beaver 18.04 Ubuntu-Desktop amd64 Installer Freeze

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