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I've been trying to install Droidcam on my Ubuntu 18.04 and I've encountered an error I can't solve:

root@homelab:/tmp/droidcam-64bit#  sudo ./install
Webcam parameters: '640' and '480'
Building v4l2loopback-dc.ko
make: Entering directory '/tmp/droidcam-64bit/v4l2loopback'
make -C /lib/modules/`uname -r`/build M=`pwd`
make[1]: Entering directory '/usr/src/linux-headers-4.18.0-15-generic'
Makefile:970: "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel"
  CC [M]  /tmp/droidcam-64bit/v4l2loopback/v4l2loopback-dc.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /tmp/droidcam-64bit/v4l2loopback/v4l2loopback-dc.mod.o
  LD [M]  /tmp/droidcam-64bit/v4l2loopback/v4l2loopback-dc.ko
make[1]: Leaving directory '/usr/src/linux-headers-4.18.0-15-generic'
make: Leaving directory '/tmp/droidcam-64bit/v4l2loopback'
Moving driver and executable to system folders
Registering webcam device
insmod: ERROR: could not insert module /lib/modules/4.18.0-15-generic/kernel/drivers/media/video/v4l2loopback-dc.ko: Unknown symbol in module

Since my microphone doesn't work I am mainly using Droidcam to emulate a mic on my linux machine using my phone. I don't need the webcam capabillities either, so if I could just create a fake device I'd be happy. I just need to stream my audio through my phone to my linux machine. If I try to open Droidcam right now, I'm getting the following error: Device not found (/dev/video[0-9]). Did you install it?

Your help would be much appreciated :) Also, here's the tutorial I followed to install Droidcam (it's the official website).

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I had the same problem and found the solution here:

https://stackoverflow.com/questions/34800731/module-not-found-when-i-do-a-modprobe

Running this:

sudo depmod -ae
sudo modprobe v4l2loopback_dc
droidcam

It is working for me.

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