Comment 3 for bug 2009436

I didn't dig into the specifics, but the error the we see in the passed test log comes from this this line from /usr/lib/dkms/dkms-autopkgtest:

# Try and remove dkms to spot packages which miss a dkms dependency
echo "I: Checking for missing dkms dependency by trying to deinstall dkms"
dpkg --remove dkms || true

So failures to execute that command are explicitly ignored (|| true). I don't see an issue with autopkgtest (package or infra) here.