Public bug reported:

/etc/modprobe.d/local-dummy.conf contains:
options dummy numdummies=10

/etc/modules-load.d/local-dummy.conf contains:
dummy

/lib/modprobe.d/systemd.conf contains:
options bonding max_bonds=0
options dummy numdummies=0

On boot, the "dummy" module is loaded with the options "numdummies=10
numdummies=0" because configuration in /lib/modprobe.d/ overrides
configuration in /etc/modprobe.d/.

This makes it impossible to automatically load the dummy module with 10
interfaces and then use them in /etc/network/interfaces.d/ because the
configuration file provided with systemd overrides my module
configuration by setting the number of interfaces back to 0.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: systemd 237-3ubuntu10.50
Uname: Linux 5.4.132+ x86_64
ApportVersion: 2.20.9-0ubuntu7.24
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 25 19:18:14 2021
InstallationDate: Installed on 2014-05-10 (2633 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.4.132+ 
root=UUID=3d2fba1f-59b9-424f-a0df-2e7f1e2d8637 ro rootflags=subvol=@ 
sysrq_always_enabled panic=600 reboot=p sd_mod.stop_before_reboot=0 
page_owner=on page_poison=1 debug_objects=1
SourcePackage: systemd
UpgradeStatus: Upgraded to bionic on 2018-11-24 (973 days ago)
dmi.bios.date: 11/22/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P7.20
dmi.board.name: Z170 Extreme4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP7.20:bd11/22/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ170Extreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
modified.conffile..etc.systemd.journald.conf: [modified]
modified.conffile..etc.systemd.logind.conf: [modified]
mtime.conffile..etc.systemd.journald.conf: 2018-11-24T15:04:07.599704
mtime.conffile..etc.systemd.logind.conf: 2015-07-04T15:46:37.746749

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic third-party-packages

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https://bugs.launchpad.net/bugs/1937953

Title:
  systemd forcibly disables use of dummy/bond interfaces

Status in systemd package in Ubuntu:
  New

Bug description:
  /etc/modprobe.d/local-dummy.conf contains:
  options dummy numdummies=10

  /etc/modules-load.d/local-dummy.conf contains:
  dummy

  /lib/modprobe.d/systemd.conf contains:
  options bonding max_bonds=0
  options dummy numdummies=0

  On boot, the "dummy" module is loaded with the options "numdummies=10
  numdummies=0" because configuration in /lib/modprobe.d/ overrides
  configuration in /etc/modprobe.d/.

  This makes it impossible to automatically load the dummy module with
  10 interfaces and then use them in /etc/network/interfaces.d/ because
  the configuration file provided with systemd overrides my module
  configuration by setting the number of interfaces back to 0.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.50
  Uname: Linux 5.4.132+ x86_64
  ApportVersion: 2.20.9-0ubuntu7.24
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Jul 25 19:18:14 2021
  InstallationDate: Installed on 2014-05-10 (2633 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.4.132+ 
root=UUID=3d2fba1f-59b9-424f-a0df-2e7f1e2d8637 ro rootflags=subvol=@ 
sysrq_always_enabled panic=600 reboot=p sd_mod.stop_before_reboot=0 
page_owner=on page_poison=1 debug_objects=1
  SourcePackage: systemd
  UpgradeStatus: Upgraded to bionic on 2018-11-24 (973 days ago)
  dmi.bios.date: 11/22/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P7.20
  dmi.board.name: Z170 Extreme4
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP7.20:bd11/22/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ170Extreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  modified.conffile..etc.systemd.journald.conf: [modified]
  modified.conffile..etc.systemd.logind.conf: [modified]
  mtime.conffile..etc.systemd.journald.conf: 2018-11-24T15:04:07.599704
  mtime.conffile..etc.systemd.logind.conf: 2015-07-04T15:46:37.746749

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