Public bug reported:

I have plenty of swap space configured in my system:

$ cat /sys/power/image_size
6642229248   # ~ 6.2GiB

$ swapon
NAME      TYPE       SIZE USED PRIO
/dev/dm-2 partition  980M   0B   -2
/dev/sda2 partition 97.7G   0B   -3

But when I attempt to hibernate:

$ sudo systemctl hibernate
Failed to hibernate system via logind: Not enough swap space for hibernation

I have the swap partition configured as my resume device in my kernel
commandline:

$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-5.8.0-33-generic root=/dev/mapper/ubuntu--vg-root ro quiet 
splash resume=UUID=73909634-a75d-42c9-8f66-a69138690756 pcie_aspm=off 
vt.handoff=7
$ ls -l /dev/disk/by-uuid/73909634-a75d-42c9-8f66-a69138690756
lrwxrwxrwx 1 root root 10 Jan  5 09:08 
/dev/disk/by-uuid/73909634-a75d-42c9-8f66-a69138690756 -> ../../sda2

(I'm not really sure how to further debug my issue, any assistance would
be appreciated!)

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: systemd 246.6-1ubuntu1
ProcVersionSignature: Ubuntu 5.8.0-33.36-generic 5.8.17
Uname: Linux 5.8.0-33-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue Jan  5 09:33:04 2021
InstallationDate: Installed on 2019-05-07 (608 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
MachineType: Gigabyte Technology Co., Ltd. B450M DS3H
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-33-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash 
resume=UUID=73909634-a75d-42c9-8f66-a69138690756 pcie_aspm=off vt.handoff=7
SourcePackage: systemd
SystemdDelta:
 [EXTENDED]   /lib/systemd/system/rc-local.service → 
/lib/systemd/system/rc-local.service.d/debian.conf
 [EXTENDED]   /lib/systemd/system/user@.service → 
/lib/systemd/system/user@.service.d/timeout.conf
 
 2 overridden configuration files found.
SystemdFailedUnits:
 Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: 
Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use 
systemd-escape?).
 Unit \xe2\x97\x8f.service could not be found.
 ------
 Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: 
Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use 
systemd-escape?).
 Unit \xe2\x97\x8f.service could not be found.
UpgradeStatus: Upgraded to groovy on 2020-06-22 (196 days ago)
dmi.bios.date: 01/25/2019
dmi.bios.release: 5.13
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F4
dmi.board.asset.tag: Default string
dmi.board.name: B450M DS3H-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF4:bd01/25/2019:br5.13:svnGigabyteTechnologyCo.,Ltd.:pnB450MDS3H:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB450MDS3H-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: Default string
dmi.product.name: B450M DS3H
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy

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https://bugs.launchpad.net/bugs/1910252

Title:
  `systemctl hibernate` incorrectly reports "Not enough swap space for
  hibernation"

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