I am attempting to install the v4l2loopback module for my device (Le Potato running Armbian 22.02.1 Bullseye) and am running to some issues.

 

I installed linux-headers-5.10.102-meson64 since that matches the kernel image installed:

marc@lepotato:/usr/src$ dpkg -l |grep linux-image
ii  linux-image-current-meson64           22.02.1                         arm64        Linux kernel, armbian version 5.10.102-meson64 current
marc@lepotato:/usr/src$ dpkg -l |grep linux-headers
ii  linux-headers-current-meson64         22.02.1                         arm64        Linux kernel headers for 5.10.102-meson64 on arm64 current

 

But when I try and install the v4l2loopback-dkms package I get the following:

marc@lepotato:/usr/src$ sudo apt-get install v4l2loopback-dkms
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages were automatically installed and are no longer required:
  caffeine python3-ewmh python3-xlib
Use 'sudo apt autoremove' to remove them.
Suggested packages:
  v4l2loopback-utils
The following NEW packages will be installed:
  v4l2loopback-dkms
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/36.2 kB of archives.
After this operation, 115 kB of additional disk space will be used.
Selecting previously unselected package v4l2loopback-dkms.
(Reading database ... 195673 files and directories currently installed.)
Preparing to unpack .../v4l2loopback-dkms_0.12.5-1_all.deb ...
Unpacking v4l2loopback-dkms (0.12.5-1) ...
Setting up v4l2loopback-dkms (0.12.5-1) ...
Loading new v4l2loopback-0.12.5 DKMS files...
Building for 5.10.102-meson64
Building initial module for 5.10.102-meson64
Error! Bad return status for module build on kernel: 5.10.102-meson64 (aarch64)
Consult /var/lib/dkms/v4l2loopback/0.12.5/build/make.log for more information.
dpkg: error processing package v4l2loopback-dkms (--configure):
 installed v4l2loopback-dkms package post-installation script subprocess returned error exit status 10
Errors were encountered while processing:
 v4l2loopback-dkms
E: Sub-process /usr/bin/dpkg returned an error code (1)

 

Looking into the error logs I see:

marc@lepotato:/usr/src$ cat /var/lib/dkms/v4l2loopback/0.12.5/build/make.log
DKMS make.log for v4l2loopback-0.12.5 for kernel 5.10.102-meson64 (aarch64)
Tue 10 May 2022 01:21:37 PM EDT
Building v4l2-loopback driver...
make -C /lib/modules/5.10.102-meson64/build M=/var/lib/dkms/v4l2loopback/0.12.5/build modules
make[1]: Entering directory '/usr/src/linux-headers-5.10.102-meson64'
  CC [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.o
  MODPOST /var/lib/dkms/v4l2loopback/0.12.5/build/Module.symvers
make[3]: *** No rule to make target 'scripts/module.lds', needed by '/var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.ko'.  Stop.
make[3]: *** Waiting for unfinished jobs....
  CC [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.mod.o
make[2]: *** [scripts/Makefile.modpost:130: __modpost] Error 2
make[1]: *** [Makefile:1726: modules] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.10.102-meson64'
make: *** [Makefile:43: v4l2loopback.ko] Error 2

 

I googled around for that error and found a lot of posts about it and found a suggested solution of downloading the module.lds file from git using:

 

sudo wget https://raw.githubusercontent.com/torvalds/linux/master/scripts/module.lds.S -O /usr/src/[your linux header version here]/scripts/module.lds
sudo sed -i '$ d' /usr/src/[your linux header version here]/scripts/module.lds

 

but when I try and reinstall the v4l2loopback module after that I now get the following:

marc@lepotato:/usr/src$ sudo apt-get install v4l2loopback-dkms                                                       Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
v4l2loopback-dkms is already the newest version (0.12.5-1).
The following packages were automatically installed and are no longer required:
  caffeine python3-ewmh python3-xlib
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up v4l2loopback-dkms (0.12.5-1) ...
Removing old v4l2loopback-0.12.5 DKMS files...

------------------------------
Deleting module version: 0.12.5
completely from the DKMS tree.
------------------------------
Done.
Loading new v4l2loopback-0.12.5 DKMS files...
Building for 5.10.102-meson64
Building initial module for 5.10.102-meson64
Error! Bad return status for module build on kernel: 5.10.102-meson64 (aarch64)
Consult /var/lib/dkms/v4l2loopback/0.12.5/build/make.log for more information.
dpkg: error processing package v4l2loopback-dkms (--configure):
 installed v4l2loopback-dkms package post-installation script subprocess returned error exit status 10
Errors were encountered while processing:
 v4l2loopback-dkms
E: Sub-process /usr/bin/dpkg returned an error code (1)

marc@lepotato:/usr/src$ cat /var/lib/dkms/v4l2loopback/0.12.5/build/make.log
DKMS make.log for v4l2loopback-0.12.5 for kernel 5.10.102-meson64 (aarch64)
Tue 10 May 2022 01:27:58 PM EDT
Building v4l2-loopback driver...
make -C /lib/modules/5.10.102-meson64/build M=/var/lib/dkms/v4l2loopback/0.12.5/build modules
make[1]: Entering directory '/usr/src/linux-headers-5.10.102-meson64'
  CC [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.o
  MODPOST /var/lib/dkms/v4l2loopback/0.12.5/build/Module.symvers
  CC [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.mod.o
  LD [M]  /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.ko
ld:scripts/module.lds:6: ignoring invalid character `#' in expression
ld:scripts/module.lds:6: syntax error
make[3]: *** [scripts/Makefile.modfinal:40: /var/lib/dkms/v4l2loopback/0.12.5/build/v4l2loopback.ko] Error 1
make[2]: *** [scripts/Makefile.modpost:130: __modpost] Error 2
make[1]: *** [Makefile:1726: modules] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.10.102-meson64'
make: *** [Makefile:43: v4l2loopback.ko] Error 2

 

At this point I am stuck. Am I missing something obvious? Can someone point me in the right direction?

 

Thanks in advance!

I think this is a known issue. Still odd since Armbian does not touch modules.lds on packaging IIRC...

Is there a workaround or does this just not work at the moment?