Comment 32 for bug 1856387

Sorry for the late reply. I'm not going to let you compile kernel, as least for now. I promise.

So it's pretty simple here. After you ran following two commands:

  $ sudo add-apt-repository ppa:vicamo/ppa-1856387
  $ sudo apt-get update

apt has rebuilt its available packages database for install, and all that you will do next is to install one or more packages listed in the ppa "View package details" link[1]. Since you were on 4.15 generic kernel, please try following:

  $ sudo apt install linux-modules-extra-4.15.0-100-generic=4.15.0-100.101+lp1856387 \
      linux-headers-4.15.0-100-generic=4.15.0-100.101+lp1856387

Note for the "=" sign. It will install all the prerequisite packages as well. Then you reboot and select to boot from 4.15.0-100-generic kernel from grub's menu, and see if now you boot into GUI as expected long time ago.

If you're also interested in having a try on -oem kernels, use:

  $ sudo apt install linux-image-unsigned-4.15.0-1080-oem=4.15.0-1080.90+lp1856387 \
      linux-headers-4.15.0-1080-oem=4.15.0-1080.90+lp1856387

[1]: https://launchpad.net/~vicamo/+archive/ubuntu/ppa-1856387/+packages