I have the same issue. Scans worked on previous versions. On web interface, Feed Status shows NVT, SCAP and CERT feeds are all current as of today. Create a target to a known-vulnerable box. Create a scan using that target. Log shows scan completes in 0.04 seconds. Scan results are empty.
On web interface, under “SecInfo” -> AllSecInformation (477135 of 477135), all entries in the Severity column say “N/A” except DFN-CERT-2019-0170. Perhaps this is normal? Have not paid attention before.
On web interface, under “SecInfo” -> NVTs (0 of 0), the display is empty. In the “NVTs by Family (Total: 0)” the graphic says, “No matching NVT”
On web interface, under SecInfo -> CVE (118124 of 118124) the display looks normal except that all entries in the Severity column say “N/A”.
On web interface, under SecInfo -> CPDs (302036 of 302036) the display looks normal and most of the entries in the Severity column have numbers in them.
Intel NUC7i5BN - 16GB memory, 300GB Flash Drive
Ubuntu 18.04.1 LTS Server updated to most recent state
Virtualbox 5.2.24 - Latest extension packs installed
2 CPUs, 2 MB memory, 20GB hard disk, internet access
Installed per directions on Greenbone website. NVT’s installed.