I downloaded the three files you mentioned and tried to install them
using 'dpkg -i *.deb' as root. Two of the pkgs installed OK but the
kernel proper did not, giving error:

  Selecting previously unselected package 
linux-image-unsigned-4.15.0-22-generic.
dpkg: regarding 
linux-image-unsigned-4.15.0-22-generic_4.15.0-22.25_lp1773704_amd64.deb 
containing linux-image-unsigned-4.15.0-22-generic:
 linux-image-unsigned-4.15.0-22-generic conflicts with 
linux-image-4.15.0-22-generic
  linux-image-4.15.0-22-generic (version 4.15.0-22.24) is present and installed.

dpkg: error processing archive 
linux-image-unsigned-4.15.0-22-generic_4.15.0-22.25_lp1773704_amd64.deb 
(--install):
 conflicting packages - not installing linux-image-unsigned-4.15.0-22-generic

I rebooted the system and as one might expect, the errors in dmesg log
persist.

I read up a bit on dpkg hoping I could -f "force" the installation but
it appears more complicated than that.

How to proceed? Strange, I've installed test kernels (for this same
issue in fact, see bug ID #1710548, which did in fact fix the problem:
but the typo in the re-write of the fix that found it's way into the
distro uproots the fix).

Again I have to underscore the fact that I've built my own kernels with
line 184 changed to be identical to line 187 and the problems are
solved.

If that was your approach, please consider your fix to have been
successfully tested.

I didn't have much trouble installing the kernels I built so the above
errors from dpkg are a mystery to me.

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https://bugs.launchpad.net/bugs/1773704

Title:
  Typo at line 184 in xhci-pci.c makes trouble for Renesas USB chipset
  in Bionic 18.04

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