Just for reference, I already have the following installed from previous testing, and they did fix the issue.
ii linux-headers-4.15.0-21 4.15.0-21.22~lp1768292 all Header files related to Linux kernel version 4.15.0
ii linux-headers-4.15.0-21-generic 4.15.0-21.22~lp1768292 amd64 Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii linux-image-unsigned-4.15.0-21-generic 4.15.0-21.22~lp1768292 amd64 Linux kernel image for version 4.15.0 on 64 bit x86 SMP
ii linux-modules-4.15.0-21-generic 4.15.0-21.22~lp1768292 amd64 Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
ii linux-modules-extra-4.15.0-21-generic 4.15.0-21.22~lp1768292 amd64 Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
Just for reference, I already have the following installed from previous testing, and they did fix the issue.
ii linux-headers- 4.15.0- 21 4.15.0- 21.22~lp1768292 all Header files related to Linux kernel version 4.15.0 4.15.0- 21-generic 4.15.0- 21.22~lp1768292 amd64 Linux kernel headers for version 4.15.0 on 64 bit x86 SMP unsigned- 4.15.0- 21-generic 4.15.0- 21.22~lp1768292 amd64 Linux kernel image for version 4.15.0 on 64 bit x86 SMP 4.15.0- 21-generic 4.15.0- 21.22~lp1768292 amd64 Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP extra-4. 15.0-21- generic 4.15.0- 21.22~lp1768292 amd64 Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
ii linux-headers-
ii linux-image-
ii linux-modules-
ii linux-modules-