> [18841.414601] PM: dpm_run_callback(): usb_dev_suspend+0x0/0x20 returns -16
> [18841.414626] PM: Device usb2 failed to suspend async: error -16

you seem to have a usb device that is blocking suspect. You don't have
many usb devices:

Bus 001 Device 002: ID 8087:8001 Intel Corp. Integrated Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 003: ID 04f3:2012 Elan Microelectronics Corp. Touchscreen
Bus 002 Device 002: ID 8087:07dc Intel Corp. Bluetooth wireless interface
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

my guess would be your touchscreen.

** Package changed: systemd (Ubuntu) => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1928198

Title:
  Failed to start Suspend: A start job for unit systemd-suspend.service
  has failed.

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