Would it be possible for you to do a kernel bisection?

First, find the last good kernel (4.19 in this case) and the first bad
-rc kernel (5.0-rc*) from http://kernel.ubuntu.com/~kernel-ppa/mainline/

Then,
$ sudo apt build-dep linux
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ cd linux
$ git bisect start
$ git bisect good $(the good version you found)
$ git bisect bad $(the bad version found)
$ make localmodconfig
$ make -j`nproc` deb-pkg
Install the newly built kernel, then reboot with it.
If the issue still happens,
$ git bisect bad
Otherwise,
$ git bisect good
Repeat to "make -j`nproc` deb-pkg" until you find the commit that causes the 
regression.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1820695

Title:
  5.0.0 kernels (5.0.0-7 and 5.0.0-8) don't boot

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  System runs fine with previous kernel 4.19.0-13-generic. On kernels
  5.0.0-7 and 5.0.0-8, system freezes after GRUB screen on the
  background picture.

  Note: The attached logs are done with kernel 4.19.0-13-generic, since
  the kernels in question don't even boot and give no chance to catch a
  log.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1820695/+subscriptions

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