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. -- You received this bug notification because you are a member of DX Packages, which is subscribed to d-conf in Ubuntu. Matching subscriptions: dx-packages 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/d-conf/+bug/1826271/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp
