I am encountering a similar issue on a new Dell G5 5587. I've installed
Ubuntu 18.10 (fresh download today) alongside Windows 10 on a 1TB nvme
SSD.

I can boot into Ubuntu, but the system hangs shortly after boot, usually
less than 5 minutes.  I have not determined what specifically triggers
the hanging.  I have noticed that it does not happen all at once. By
that I mean that I lose mouse first (touchpad and wireless mouse), but I
can still use the keyboard (sometimes) for a few seconds after the mouse
is gone. This makes me wonder if the system is actually frozen or if
there is just no HID being recognized.  I've also seen the system "lag"
input from the keyboard: no response immediately but 30-40 seconds later
characters that I typed will appear. I also notice that the fans kick on
high, so there may be a runaway processes.

In the current state 18.10 is unusable. I haven't even been able tail
the log files, I encounter the hang before I have time to troubleshoot
the issue. I'm not sure if it's the same issue or something specific to
my hardware, I'll update as I continue to try to troubleshoot.

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https://bugs.launchpad.net/bugs/1798961

Title:
  Random unrecoverable freezes on Ubuntu 18.10

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