New power manager or locker error since latest update

[MR ZenWiz]

On Sat, Feb 3, 2018 at 3:03 PM, MR ZenWiz <mrzenwiz at gmail.com> wrote:
> I run Xubuntu 16.04 LTS.  Up until the last update, I was doing fine,
> but now I'm seeing errors like this on a regular, though long-time
> delayed, basis:
>
> $ [29757:29782:0203/005937:ERROR:object_proxy.cc(583)] Failed to call
> method: org.freedesktop.PowerManagement.Inhibit.Inhibit: object_path=
> /org/freedesktop/PowerManagement/Inhibit:
> org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.PowerManagement was not provided by any .service files
> [29757:29782:0203/005937:ERROR:power_save_blocker_x11.cc(334)] No
> response to Inhibit() request!
> [29757:29782:0203/005938:ERROR:object_proxy.cc(583)] Failed to call
> method: org.freedesktop.PowerManagement.Inhibit.UnInhibit:
> object_path= /org/freedesktop/PowerManagement/Inhibit:
> org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.PowerManagement was not provided by any .service files
> [29757:29782:0203/005938:ERROR:power_save_blocker_x11.cc(406)] No
> response to Uninhibit() request!
>
> I thought it might be a power manager thing, but I have that disabled
> from the startup session because it interferes with xscreensaver and
> my ability to run sound track while the machine is locked or the
> laptop lid is closed.
>
> They seem to show up mainly when I unlock the machine.
>
> I'm seeing this on my desktop and my laptop.
>
> What changed that would cause this?
>
> Thanks.
>
> MR

Also this one (which actually happened a fwe days ago...):

 [WARNING:flash/platform/pepper/pep_module.cpp(63)] SANDBOXED
[29757:29782:0201/061001:ERROR:object_proxy.cc(583)] Failed to call
method: org.freedesktop.PowerManagement.Inhibit.Inhibit: object_path=
/org/freedesktop/PowerManagement/Inhibit:
org.freedesktop.DBus.Error.ServiceUnknown: The name
org.freedesktop.PowerManagement was not provided by any .service files
[29757:29782:0201/061001:ERROR:power_save_blocker_x11.cc(334)] No
response to Inhibit() request!
[29757:29782:0201/061003:ERROR:object_proxy.cc(583)] Failed to call
method: org.freedesktop.PowerManagement.Inhibit.UnInhibit:
object_path= /org/freedesktop/PowerManagement/Inhibit:
org.freedesktop.DBus.Error.ServiceUnknown: The name
org.freedesktop.PowerManagement was not provided by any .service files
[29757:29782:0201/061003:ERROR:power_save_blocker_x11.cc(406)] No
response to Uninhibit() request!