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[Bug 1528378] Re: Possibly-bogus error about missing dkms.conf file during autoremove

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The error message occurs during any normal kernel update, not just during autoremove.
I can reproduce it at will with  "sudo apt-get install --reinstall linux-image-4.2.0-29-generic" (or whatever the latest version is).

I changed the bug title accordingly

** Description changed:

- Running "apt-get autoremove" after a kernel update produces messages
- like this:
+ Updating the kernel, or anything which requires rebuilding initramfs
+ (including "apt-get autoremove") produces error messages like this:
  
-     run-parts: executing /etc/kernel/postinst.d/dkms 4.2.0-19-generic /boot/vmlinuz-4.2.0-19-generic
-     Error! Could not locate dkms.conf file.
-     File:  does not exist.
+     run-parts: executing /etc/kernel/postinst.d/dkms 4.2.0-19-generic /boot/vmlinuz-4.2.0-19-generic
+     Error! Could not locate dkms.conf file.
+     File:  does not exist.
  
  But dkms seems to be working fine -- virtualbox modules get rebuilt as
  they should be.   There might be some other package which is broken with
  respect to dkms.conf, but the message gives no hint about where to look.
  
  I tried to figure out where the message is coming from, but got no hits (other than log files) from
-   # find /boot /etc /lib* /bin /sbin /usr /var -type f -print0 |  xargs -0 zgrep -l 'Error.*Could not locate'
+   # find /boot /etc /lib* /bin /sbin /usr /var -type f -print0 |  xargs -0 zgrep -l 'Error.*Could not locate'
  
  I will attach /var/log/apt/term.log
  
  ACTUAL RESULTS:
-    Error saying dkms.conf is missing
+    Error saying dkms.conf is missing
  
  EXPECTED RESULTS:
-    No error, or else an error which indicates which module is broken or the path of the missing file
+    No error, or else an error which indicates which module is broken or the path of the missing file
  
  (If the underlying problem is not in the above postinst script, but in
  another module which produces the un-useful iagnostic, please redirect
  this bug to that package).
  
  $ locate dkms.conf
  /etc/modprobe.d/dkms.conf    # this one is empty
  /home/jima/flashcache/flashcache-wt/src/dkms.conf
  /home/jima/flashcache/src/dkms.conf
  /usr/share/virtualbox/src/vboxhost/dkms.conf
  /usr/src/bbswitch-0.7/dkms.conf
  /usr/src/nvidia-352-updates-352.63/dkms.conf
  /var/lib/dkms/bbswitch/0.7/build/dkms.conf
  /var/lib/dkms/nvidia-352-updates/352.63/build/dkms.conf
  /var/lib/dkms/vboxhost/5.0.12/build/dkms.conf
  /var/lib/dkms/vboxhost/5.0.9/build/dkms.conf
  /var/lib/dkms_SAVE/vboxhost/4.3.10/build/dkms.conf
  /var/lib/dpkg/info/dkms.conffiles   # all files listed herein exist
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-extra-4.2.0-19-generic 4.2.0-19.23
  ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  jima       2484 F.... pulseaudio
-  /dev/snd/controlC0:  jima       2484 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  jima       2484 F.... pulseaudio
+  /dev/snd/controlC0:  jima       2484 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Dec 21 14:33:19 2015
  HibernationDevice: RESUME=UUID=692a674b-d118-4d8a-906c-ecd9d1accff7
  InstallationDate: Installed on 2013-08-06 (867 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  IwConfig:
-  eth0      no wireless extensions.
-  
-  lo        no wireless extensions.
+  eth0      no wireless extensions.
+ 
+  lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB:
-  
+ 
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=UUID=cb77f6cf-d3da-493f-bad6-2c7bdf5f1550 ro quiet splash
  RelatedPackageVersions:
-  linux-restricted-modules-4.2.0-22-generic N/A
-  linux-backports-modules-4.2.0-22-generic  N/A
-  linux-firmware                            1.149.3
+  linux-restricted-modules-4.2.0-22-generic N/A
+  linux-backports-modules-4.2.0-22-generic  N/A
+  linux-firmware                            1.149.3
  RfKill:
-  
+ 
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-11-09 (42 days ago)
  dmi.bios.date: 09/21/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1408
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1408:bd09/21/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6T:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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https://bugs.launchpad.net/bugs/1528378

Title:
  Possibly-bogus error about missing dkms.conf file during autoremove

Status in One Hundred Papercuts:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Updating the kernel, or anything which requires rebuilding initramfs
  (including "apt-get autoremove") produces error messages like this:

      run-parts: executing /etc/kernel/postinst.d/dkms 4.2.0-19-generic /boot/vmlinuz-4.2.0-19-generic
      Error! Could not locate dkms.conf file.
      File:  does not exist.

  But dkms seems to be working fine -- virtualbox modules get rebuilt as
  they should be.   There might be some other package which is broken
  with respect to dkms.conf, but the message gives no hint about where
  to look.

  I tried to figure out where the message is coming from, but got no hits (other than log files) from
    # find /boot /etc /lib* /bin /sbin /usr /var -type f -print0 |  xargs -0 zgrep -l 'Error.*Could not locate'

  I will attach /var/log/apt/term.log

  ACTUAL RESULTS:
     Error saying dkms.conf is missing

  EXPECTED RESULTS:
     No error, or else an error which indicates which module is broken or the path of the missing file

  (If the underlying problem is not in the above postinst script, but in
  another module which produces the un-useful iagnostic, please redirect
  this bug to that package).

  $ locate dkms.conf
  /etc/modprobe.d/dkms.conf    # this one is empty
  /home/jima/flashcache/flashcache-wt/src/dkms.conf
  /home/jima/flashcache/src/dkms.conf
  /usr/share/virtualbox/src/vboxhost/dkms.conf
  /usr/src/bbswitch-0.7/dkms.conf
  /usr/src/nvidia-352-updates-352.63/dkms.conf
  /var/lib/dkms/bbswitch/0.7/build/dkms.conf
  /var/lib/dkms/nvidia-352-updates/352.63/build/dkms.conf
  /var/lib/dkms/vboxhost/5.0.12/build/dkms.conf
  /var/lib/dkms/vboxhost/5.0.9/build/dkms.conf
  /var/lib/dkms_SAVE/vboxhost/4.3.10/build/dkms.conf
  /var/lib/dpkg/info/dkms.conffiles   # all files listed herein exist

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-extra-4.2.0-19-generic 4.2.0-19.23
  ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jima       2484 F.... pulseaudio
   /dev/snd/controlC0:  jima       2484 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Dec 21 14:33:19 2015
  HibernationDevice: RESUME=UUID=692a674b-d118-4d8a-906c-ecd9d1accff7
  InstallationDate: Installed on 2013-08-06 (867 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=UUID=cb77f6cf-d3da-493f-bad6-2c7bdf5f1550 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-22-generic N/A
   linux-backports-modules-4.2.0-22-generic  N/A
   linux-firmware                            1.149.3
  RfKill:

  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-11-09 (42 days ago)
  dmi.bios.date: 09/21/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1408
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1408:bd09/21/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6T:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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