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linux/v4l2: added downgrade note

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@ -93,3 +93,11 @@ To fix it downgrade the packages `v4l2loopback-dkms` and `v4l2loopback-utils` to
version. version.
For [Arch Linux](/wiki/linux/arch-linux.md) this can be achieved by using For [Arch Linux](/wiki/linux/arch-linux.md) this can be achieved by using
[Downgrade](/wiki/linux/package_manager.md#downgrading-packages). [Downgrade](/wiki/linux/package_manager.md#downgrading-packages).
### `Error! Bad return status for module build on kernel`
When updating the `v4l2loopback` package this error can occur after the creation of the
[initramfs](/wiki/linux/mkinitcpio.md).
This may point to an incompatibility of the package and kernel version which can only but easily
and temporarily be fixed by downgrading the package as described in
[the corresponding package manager section](/wiki/linux/package_manager.md#downgrading-packages).