Public bug reported:

Package installation log includes the following:

/etc/kernel/header_postinst.d/dkms:
ERROR (dkms apport): kernel package linux-headers-4.18.0-041800-generic is not 
supported
Error! Bad return status for module build on kernel: 4.18.0-041800-generic 
(x86_64)

"dkms --all autoinstall" gives me the following:

Error! Your kernel headers for kernel  cannot be found.
Please install the linux-headers- package,
or use the --kernelsourcedir option to tell DKMS where it's located

Note the double space in: "kernel  cannot". It looks as if it tried to
print an empty string - version detection failed? I do have package
headers installed:

root@d33tah-pc:/tmp/kernel# dpkg -l | grep 'linux.*4.18'
ii  linux-headers-4.18.0-041800                     4.18.0-041800.201808122131  
                 all          Header files related to Linux kernel version 
4.18.0
ii  linux-headers-4.18.0-041800-generic             4.18.0-041800.201808122131  
                 amd64        Linux kernel headers for version 4.18.0 on 64 bit 
x86 SMP
ii  linux-image-unsigned-4.18.0-041800-generic      4.18.0-041800.201808122131  
                 amd64        Linux kernel image for version 4.18.0 on 64 bit 
x86 SMP
ii  linux-modules-4.18.0-041800-generic             4.18.0-041800.201808122131  
                 amd64        Linux kernel extra modules for version 4.18.0 on 
64 bit x86 SMP

** Affects: dkms
     Importance: Undecided
         Status: New

** Affects: linux
     Importance: Undecided
         Status: New

** Affects: nvidia
     Importance: Undecided
         Status: New

** Also affects: dkms
   Importance: Undecided
       Status: New

** No longer affects: acpi-call (Ubuntu)

** Also affects: nvidia
   Importance: Undecided
       Status: New

** Also affects: linux
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1787262

Title:
  4.18 mainline kernel fails to build nvidia dkms driver

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