Public bug reported:

Only applicable to Ubuntu 18.04. Changes made via "hostnamectl set-
hostname" are not persistent - reverts after a reboot.

See results details below:

# hostnamectl status
   Static hostname: xxxlxd903
         Icon name: computer-vm
           Chassis: vm
        Machine ID: ee8de2e6dffc42f9985e4e0c5350bda2
           Boot ID: 463b63d5bc3942a9abacdf34054644b4
    Virtualization: vmware
  Operating System: Ubuntu 18.04 LTS
            Kernel: Linux 4.15.0-24-generic
      Architecture: x86-64

# hostnamectl set-hostname xxxlxd903x

# hostnamectl status
   Static hostname: xxxlxd903x
         Icon name: computer-vm
           Chassis: vm
        Machine ID: ee8de2e6dffc42f9985e4e0c5350bda2
           Boot ID: 463b63d5bc3942a9abacdf34054644b4
    Virtualization: vmware
  Operating System: Ubuntu 18.04 LTS
            Kernel: Linux 4.15.0-24-generic
      Architecture: x86-64

# shutdown -r now

...

$ hostnamectl status
   Static hostname: xxxlxd903
         Icon name: computer-vm
           Chassis: vm
        Machine ID: ee8de2e6dffc42f9985e4e0c5350bda2
           Boot ID: ffb13e8eb23f40029a7685178229c2bb
    Virtualization: vmware
  Operating System: Ubuntu 18.04 LTS
            Kernel: Linux 4.15.0-24-generic
      Architecture: x86-64

Note: System is fully patched now. Was happening earlier too - with a
fresh install.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: systemd 237-3ubuntu10
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Wed Jul  4 12:52:19 2018
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: VMware, Inc. VMware Virtual Platform
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-24-generic 
root=UUID=72a62618-633d-11e8-9a7c-005056911d79 ro maybe-ubiquity
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/05/2016
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd04/05/2016:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.
modified.conffile..etc.systemd.timesyncd.conf: [modified]
mtime.conffile..etc.systemd.timesyncd.conf: 2018-05-29T20:59:09.725641

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


** Tags: amd64 apport-bug bionic uec-images

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https://bugs.launchpad.net/bugs/1780017

Title:
  Hostname changes not persistent

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