you could preseed your installer to install the kernel in the PPA. I
have not tested the instructions below.. but should give you an idea how
to preseed. From your comment above looks like you might not have a
booting system to be able to install the new kernel etc.

Assuming you are using a netboot install.

-- tell installer grub to use preseed --
Edit ubuntu-installer/ppc64el/grub/grub.cfg and add your preseed file. Like for 
example:

menuentry 'Install' {
    set background_color=black
    linux    /ubuntu-installer/ppc64el/linux auto=true priority=critical 
url=http://<web server>/preseed/preseed.ppc64el --- quiet
    initrd   /ubuntu-installer/ppc64el/initrd.gz
}

-- preseed example --
You can use late-commands in your preseed file to install the PPA kernel like:

# Install kernel from PPA
d-i preseed/late_command string in-target add-apt-repository -y 
ppa:ubuntu-power-triage/lp1770003
d-i preseed/late_command string in-target apt update
d-i preseed/late_command string in-target apt install -y 
linux-image-unsigned-4.15.0-20-generic linux-modules-extra-4.15.0-20-generic

-- 
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/1767194

Title:
  [SRU][Bionic][Thunderx2] kernel panic when connecting a PLX bridge

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  If a PLX bridge is connected on a ThunderX2 the Linux kernel panics on boot.

  [Fix]
  The following patches upstream fixes this issue.
  204f4afa7ae5 PCI: Remove redundant probes for device reset support
  5b0764cac9f1 PCI: Probe for device reset support during enumeration

  [Test]
  1) Connect a PLX bridge to the root complex
  2) Boot Ubuntu kernel

  [Regression Potential]
  This only impacts ThunderX2.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1767194/+subscriptions

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