Hi Dan, 
Here we go:

$ free
              total        used        free      shared  buff/cache   available
Mem:       31690904     1853316    27397880     1260984     2439708    28141244
Swap:      35651576           0    35651576

$ cat /proc/swaps
Filename                                Type            Size    Used    Priority
/swapfile                               file            2097148 0       -2
/dev/sda1                               partition       33554428        0       0


So there is plenty of (unused) swap space.

However, today I found out that with the latest SW update the problem
can not be (so easily) reproduced:

Kernel 5.3.0.28 --> 5.3.0.40
Chromium 79.0.3945 --> 80.0.3987
Systemd 237-3ubuntu10.38 --> 237-3ubuntu10.39

For example, the problem does no longer occur after a (forced) reboot
(killing chromium) and letting chrome/chromium do a recovery.  This was
previously absolutely an easy way to reproduce the problem...

$ busctl call org.freedesktop.login1 /org/freedesktop/login1 
org.freedesktop.login1.Manager CanHibernate
s "yes"

So, at the moment it is unclear as from when the problem will start to
occur, that is, if it is not solved by one of these patches.

>From the change logs
(http://changelogs.ubuntu.com/changelogs/pool/main/s/systemd/systemd_237-3ubuntu10.39/changelog,
https://www.ubuntuupdates.org/bugs?package_name=chromium-browse), it's
not obvious what could have fixed this...

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https://bugs.launchpad.net/bugs/1862797

Title:
  Systemd does not allow hibernation when Chrome/chromium is running

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