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 -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp