The command restarts NetworkManager. For some reason, NetworkManager does not properly awake on your system. Since, the kernel is responsible for the suspend function, you could try updating it. Installing the package "linux-image-generic-hwe-8.0" (in Trisquel's repository) will give you version 4.15. You can have version 4.19 or even 5.1 following the instructions on https://jxself.org/linux-libre/

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