Device '/dev/video1' is not a output device - While device seen as output by v4l2-ctl

Bug #1903926 reported by Len Ovens
This bug report is a duplicate of:  Bug #1901491: Created devices are not available. Edit Remove
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This bug affects 1 person
Affects Status Importance Assigned to Milestone
v4l2loopback (Ubuntu)
New
Undecided
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Bug Description

on Unbuntu 20.04 LTS with v4l2loopback-dkms v0.12.3-1ubuntu0.1

The kernel module loads fine, but none of the applications or utilities that try to connect to the loopback device can use it. They report various things from "device" busy to "Device '/dev/video5' is not a output device." (from gst-launch-1.0)

It seems this is a known problem:https://github.com/umlaeute/v4l2loopback/issues/370
The solution is to force install the same package from 20.10 v4l2loopback-dkms_0.12.5-1_all.deb

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