Comment 9 for bug 1848953

@florin two tests in need here:

[backport-iwlwifi-dkms]

1. Install backport-iwlwifi-dkms from PPA[1]:

  $ sudo add-apt-repository ppa:canonical-hwe-team/backport-iwlwifi && sudo apt-get update
  $ sudo apt-get install backport-iwlwifi-dkms

2. The installation step above should also trigger dkms module installation for current kernel. You should make sure its status is "installed" in the output of `dkms status`:

  $ dkms status
  backport-iwlwifi, 8042, 5.3.0-19-generic, x86_64: installed

3. Now reboot again and paste the dmesg log in /var/log/dmesg, not screenshots.

[mainline kernel]

1. From Ubuntu mainline kernel page[2], scroll down to the end, find the latest one, which should be v5.4-rc5. You'll need following ones:

  linux-headers-5.4.0-050400rc5_5.4.0-050400rc5.201910271430_all.deb
  linux-headers-5.4.0-050400rc5-generic_5.4.0-050400rc5.201910271430_amd64.deb
  linux-image-unsigned-5.4.0-050400rc5-generic_5.4.0-050400rc5.201910271430_amd64.deb
  linux-modules-5.4.0-050400rc5-generic_5.4.0-050400rc5.201910271430_amd64.deb

which are basically arch-indep _all and arch-dependent -generic debs. Download them and install with `dpkg -i *.deb`.

2. Reboot into the newly installed kernel. It should be the default choice because it should be the newest kernel on your system, but you might still need to interrupt grub and select the correct one.

3. Paste the dmesg log in /var/log/dmesg, not screenshots.

[1]: https://launchpad.net/~canonical-hwe-team/+archive/ubuntu/backport-iwlwifi
[2]: https://kernel.ubuntu.com/~kernel-ppa/mainline/