Got exactly the same problem!
After executing: sudo systemctl restart dlm, in dmesg:
[ 55.758759] PKCS#7 signature not signed with a trusted key
[ 55.758775] evdi: loading out-of-tree module taints kernel.
[ 55.758890] evdi: module verification failed: signature and/or required key missing - tainting kernel
[ 55.762943] evdi: [I] Initialising logging on level 5
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