According to the Debian bug #786779, upgrading to v42loopback 0.9.0 should solve this issue as it compile properly with newer Linux kernels (including 4.0).
** Bug watch added: Debian Bug tracker #786779 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=786779 ** Also affects: v4l2loopback (Debian) via http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=786779 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1455791 Title: v4l2loopback-dkms 0.8.0-1: v4l2loopback kernel module failed to build To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/v4l2loopback/+bug/1455791/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs