I have read other thread regarding v4l2loopback kernel module installation.

I got same problem like this message below

=========================================

------------------------------
Deleting module version: 0.10.0
completely from the DKMS tree.
------------------------------
Done.
Unpacking v4l2loopback-dkms (0.10.0-1) over (0.10.0-1) ...
Setting up v4l2loopback-dkms (0.10.0-1) ...
Loading new v4l2loopback-0.10.0 DKMS files...
dpkg: warning: version '3.4.113-sun8i
4.19.25' has bad syntax: invalid character in revision number
Building for 4.19.20-sunxi64
Module build for kernel 4.19.20-sunxi64 was skipped since the
kernel headers for this kernel does not seem to be installed.
 

===================================

I am usng Nano PI neo2 with armbian 4.19.20.

When I install the kernel-headers using armbian-config, the version of kernel-headers installed is 4.19.25.

Either the kernel source I have installed using armbian-config is 4.19.25.

 

I just guess the version mistach doesn't make me succeed build of v4l2loopback.

But I can't figure out what to do with this error.

 

Please give me some comment.

 

I have installed correct headers.

And tried to build v4l2loopback again and get below message failed.

What's wrong with me ?

 

--------------------------------------------

root@nanopineo2:/usr/src# apt-get install --reinstall v4l2loopback-dkms
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/23.1 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 53947 files and directories currently installed.)
Preparing to unpack .../v4l2loopback-dkms_0.10.0-1ubuntu1_all.deb ...

-------- Uninstall Beginning --------
Module:  v4l2loopback
Version: 0.10.0
Kernel:  4.19.25-sunxi64 (aarch64)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.

v4l2loopback.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.19.25-sunxi64/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

depmod....

DKMS: uninstall completed.

------------------------------
Deleting module version: 0.10.0
completely from the DKMS tree.
------------------------------
Done.
Unpacking v4l2loopback-dkms (0.10.0-1ubuntu1) over (0.10.0-1ubuntu1) ...
Setting up v4l2loopback-dkms (0.10.0-1ubuntu1) ...
Loading new v4l2loopback-0.10.0 DKMS files...
Building for 4.19.25-sunxi64
Building initial module for 4.19.25-sunxi64
Error! Bad return status for module build on kernel: 4.19.25-sunxi64 (aarch64)
Consult /var/lib/dkms/v4l2loopback/0.10.0/build/make.log for more information.
root@nanopineo2:/usr/src# cd linux-headers-4.19.25-sunxi64/
root@nanopineo2:/usr/src/linux-headers-4.19.25-sunxi64# make scripts
root@nanopineo2:/usr/src/linux-headers-4.19.25-sunxi64#
root@nanopineo2:/usr/src/linux-headers-4.19.25-sunxi64# apt-get install --reinstall v4l2loopback-dkms
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/23.1 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 53947 files and directories currently installed.)
Preparing to unpack .../v4l2loopback-dkms_0.10.0-1ubuntu1_all.deb ...

------------------------------
Deleting module version: 0.10.0
completely from the DKMS tree.
------------------------------
Done.
Unpacking v4l2loopback-dkms (0.10.0-1ubuntu1) over (0.10.0-1ubuntu1) ...
Setting up v4l2loopback-dkms (0.10.0-1ubuntu1) ...
Loading new v4l2loopback-0.10.0 DKMS files...
Building for 4.19.25-sunxi64
Building initial module for 4.19.25-sunxi64
Error! Bad return status for module build on kernel: 4.19.25-sunxi64 (aarch64)
Consult /var/lib/dkms/v4l2loopback/0.10.0/build/make.log for more information.
root@nanopineo2:/usr/src/linux-headers-4.19.25-sunxi64#