Felipe, 
can you try to cancel the lid option? you do it with 
sudo sh -c "echo LID0 disabled > /proc/acpi/wakeup"
than check it is '*disabled' in the LID0 entry, by running
cat  /proc/acpi/wakeup
and check the output. 

You can close the lid and it will sleep, but it will not wakeup when you open 
the lid, only when you press the power button to start it. 
Let me know if it works for you.

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https://bugs.launchpad.net/bugs/1801743

Title:
  Suspend fails in Kubuntu 18.04 but works fine in Kubuntu 17.10

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