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I'm running Ubuntu 18.04 on a Lenovo P50

I've tried to hibernate from the command line with sudo systemctl hibernate and what I get is

Failed to hibernate system via logind: Sleep verb not supported

And also cat /sys/power/disk

[platform] shutdown reboot suspend test_resume

Some additional information:

free
              total        used        free      shared  buff/cache   available
Mem:       15656592     4578236     8186108      183960     2892248    12247168
Swap:       2097148           0     2097148
swapon --summary
Filename                Type        Size    Used    Priority
/swapfile                               file        2097148 0   -2

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