We currently using few machines and issue exist on this ubuntu environment: 
Distribution: Ubuntu 18.04.3 LTS
Architecture: amd64
Running kernel: 4.15.0-88-generic
Kernel version: 4.15.0.88.88

Regarding to model machines: 
Dell Precision 5530
Dell Precision 5520
Dell Precision 5510
Precision Tower 3630,
Precision Tower 3620,
Dell Latitude 5400

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https://bugs.launchpad.net/bugs/1864982

Title:
  Ubuntu desktop computer doesn't seem to lock correctly

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