I encountered this error as well, however manual removal via 'dkms
remove' is still operational.
- Bug#996104: dkms: Fail to remove modules Christian Marillat
- Bug#996104: dkms: Fail to remove modules S R Wright
- Bug#996104: dkms: Fail to remove modules Damir R. Islamov
- Bug#996104: dkms: Fail to remove modules Damir Islamov
- Bug#996104: dkms: Fail to remove modules Vincent Lefevre