I had been facing the same problem along with one more user account named "No value has been set". For "Libvirt Qemu" tried purging "qemu-kvm" and it's configuration files. But still user account was existed. I had been trying for the solution and found one that you can also try. (I'm using linux mint 18.2 Sonya)
Go to location /etc/ as root and find a file named "passwd" and open it. Now find the line "libvirt-qemu:x:64055:132:Libvirt Qemu,,,:/var/lib/libvirt:/bin/false" (see the image I attached not to get confused, values may vary in your case) and clear it (don't clear any other line which is not related to "libvirt-qemu"). I found that line almost at the end of the list. If you're having one more user account named "No value has been set" then clear the line below: "<admin name>:x:1001:1002:No value has been set:/dev/null:/dev/null" (values may vary in your case) And now I don't have these user accounts or any other issue after removing those values: "libvirt qemu" and "No value has been set" ** Attachment added: "IMG_20170914_192319.jpg" https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1667113/+attachment/4950189/+files/IMG_20170914_192319.jpg -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1667113 Title: System users appears in Ligthdm and user switcher (Accountsservice has no filter for shell types) Status in accountsservice package in Ubuntu: Confirmed Status in base-passwd package in Ubuntu: Invalid Status in ceph package in Ubuntu: Confirmed Status in ifmail package in Ubuntu: Confirmed Status in libvirt package in Ubuntu: Confirmed Status in lightdm package in Ubuntu: Confirmed Status in netqmail package in Ubuntu: Confirmed Status in sddm package in Ubuntu: Fix Released Bug description: "Technical" user libvirt Qemu appears in the list of user in Ligthdm, among the real regular users. It probably shouldn't ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: libvirt-bin 2.5.0-3ubuntu2 ProcVersionSignature: Ubuntu 4.9.0-15.16-generic 4.9.5 Uname: Linux 4.9.0-15-generic x86_64 NonfreeKernelModules: zfs zunicode zavl zcommon znvpair ApportVersion: 2.20.4-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity:Unity7 Date: Wed Feb 22 22:09:24 2017 InstallationDate: Installed on 2017-02-01 (21 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Alpha amd64 (20170201) KernLog: SourcePackage: libvirt UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1667113/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
