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[Tim Crisall <1826271@xxxxxxxxxxxxxxxxxx>]

Thought I was hitting this same issue - turns out it wasn't quite the
same as I did NOT have dconf-editor available.

Ended up figuring this out as follows:

virt-manager --debug

<...go into preferences screen...>

(virt-manager:10411): dconf-WARNING **: 03:20:30.256: failed to commit changes to dconf: Failed to execute child process “dbus-launch” (No such file or directory)
[Fri, 29 Nov 2019 03:20:30 virt-manager 10411] DEBUG (preferences:97) Showing preferences

apt install dbus-x11

all good now.

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https://bugs.launchpad.net/bugs/1826271

Title:
  virt-manager does not save preferences

Status in d-conf package in Ubuntu:
  Confirmed
Status in virt-manager package in Ubuntu:
  Incomplete

Bug description:
  running Ubuntu 18.04.2 LTS with KDE Plasma 5.12.7 (Qt 5.9.5)
  after a recent discover software update virt-manager no longer saves preferences. preferences were correctly saved previously (march 2019 and earlier)

  /usr/bin/virt-manager
  edit -> preferences -> polling
  select poll disk i/o
  select memory stats
  close window

  virt-manager displays cpu usage only.
  on restart preferences have not been saved

  also, when starting vm's the virtual machine terminal is too small.
  previously (march 2019 and earlier) the vm terminals would 'remember'
  the window-size that had been made.

  something must be 'broken'. can't find virt-manager preferences in any text
  file to determine if the file is written-to.

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