Error launching manager: 'NoneType' object has no attribute 'get_default_storage_format' Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 889, in _do_show_create self._get_create_dialog().show(src.topwin, uri) File "/usr/share/virt-manager/virtManager/create.py", line 170, in show self.reset_state(uri) File "/usr/share/virt-manager/virtManager/create.py", line 393, in reset_state self.addstorage.reset_state() File "/usr/share/virt-manager/virtManager/addstorage.py", line 196, in reset_state fmt = self.conn.get_default_storage_format() AttributeError: 'NoneType' object has no attribute 'get_default_storage_format'

This looks to be the same bug as
https://bugzilla.redhat.com/show_bug.cgi?id=1074120

Reproducible by installing Kubuntu (maybe any non-gnome based flavor), installing virt-manager and trying to make a new VM. Looks to be a dependency issue as qemu-kvm is missing. Maybe virt-manager should depend on qemu-kvm (or at least recommend). After installling qemu-kvm, restart and it works fine.

Status changed to 'Confirmed' because the bug affects multiple users.

I have the same problem:

Error launching manager: 'NoneType' object has no attribute 'get_default_storage_format'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/engine.py", line 889, in _do_show_create
    self._get_create_dialog().show(src.topwin, uri)
  File "/usr/share/virt-manager/virtManager/create.py", line 170, in show
    self.reset_state(uri)
  File "/usr/share/virt-manager/virtManager/create.py", line 393, in reset_state
    self.addstorage.reset_state()
  File "/usr/share/virt-manager/virtManager/addstorage.py", line 196, in reset_state
    fmt = self.conn.get_default_storage_format()
AttributeError: 'NoneType' object has no attribute 'get_default_storage_format'

@teodori-serge,

are you trying to create kvm vms? Can you show the output of

dpkg -l | grep qemu

?

Installing qemu-kvm fixes this for me, so the bug here is that it should present a more friendly error message.

Even if you went based on the error presented, storage is highly misleading.

Confirmed, installing qemu-kvm resolves this issue.

Installing qemu-kvm resolves this issue for me too. Thanks tgm4883.

I was editing vm details within virt-manager of a running win7_x64 machine. I added 250gb, virtio bus, qcow2, and cache none. I rebooted windows and this error appeared. I already have qemu-kvm installed. OS is Debian 8 amd64.

Error launching details: 'NoneType' object has no attribute 'set_label'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/engine.py", line 610, in _show_vm_helper
    details.show()
  File "/usr/share/virt-manager/virtManager/details.py", line 569, in show
    self.refresh_vm_state()
  File "/usr/share/virt-manager/virtManager/details.py", line 1417, in refresh_vm_state
    self.change_run_text(vm.hasSavedImage())
  File "/usr/share/virt-manager/virtManager/details.py", line 1400, in change_run_text
    self.widget("details-menu-run").get_child().set_label(text)
AttributeError: 'NoneType' object has no attribute 'set_label'

root@vm1:~# cat /etc/debian_version
jessie/sid
root@vm1:~# cat /etc/os-release
NAME="Ubuntu"
VERSION="14.04.4 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.4 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
root@vm1:~# dpkg -l | grep qemu
ii ipxe-qemu 1.0.0+git-20131111.c3d1e78-2ubuntu1.1 all PXE boot firmware - ROM images for qemu
ii qemu-keymaps 2.0.0+dfsg-2ubuntu1.24 all QEMU keyboard maps
ii qemu-kvm 2.0.0+dfsg-2ubuntu1.24 amd64 QEMU Full virtualization
ii qemu-system-common 2.0.0+dfsg-2ubuntu1.24 amd64 QEMU full system emulation binaries (common files)
ii qemu-system-x86 2.0.0+dfsg-2ubuntu1.24 amd64 QEMU full system emulation binaries (x86)
ii qemu-utils 2.0.0+dfsg-2ubuntu1.24 amd64 QEMU utilities
root@vm1:~# dpkg -l | grep libvirt
ii libvirt-bin 1.2.2-0ubuntu13.1.17 amd64 programs for the libvirt library
ii libvirt0 1.2.2-0ubuntu13.1.17 amd64 library for interfacing with different virtualization systems
ii python-libvirt 1.2.2-0ubuntu2 amd64 libvirt Python bindings
root@vm1:~# dpkg -l | grep virt-manager
ii virt-manager 0.9.5-1ubuntu3 all desktop application for managing virtual machines
root@vm1:~#

I hit the same problem with Fedora 24 workstation, the solution was to install qemu-kvm-tools
$sudo dnf install qemu-kvm-tools

Same problem.

virt-manager --debug:
[Ср, 23 май 2018 12:17:53 virt-manager 9023] DEBUG (guest:248) Setting Guest.os_variant to 'generic'
[Ср, 23 май 2018 12:17:53 virt-manager 9023] DEBUG (distroinstaller:191) Error validating install location
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 186, in _validate_location
    dev.path = val
  File "/usr/share/virt-manager/virtinst/devicedisk.py", line 511, in _set_path
    self._set_xmlpath(self.path)
  File "/usr/share/virt-manager/virtinst/devicedisk.py", line 712, in _set_xmlpath
    if self._storage_backend.get_dev_type() == "network":
  File "/usr/share/virt-manager/virtinst/diskbackend.py", line 600, in get_dev_type
    self._conn.is_remote())
  File "/usr/share/virt-manager/virtinst/diskbackend.py", line 203, in _get_dev_type

uname -a
Linux adm2 4.4.0-127-generic #153-Ubuntu SMP Sat May 19 10:58:46 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

    if vol_xml.file_type == libvirt.VIR_STORAGE_VOL_BLOCK:
  File "/usr/share/virt-manager/virtinst/storage.py", line 717, in _get_vol_type
    return self._pool_xml.get_disk_type()
AttributeError: 'NoneType' object has no attribute 'get_disk_type'
[Ср, 23 май 2018 12:17:53 virt-manager 9023] ERROR (error:142) Ошибка валидации: Ошибка при выборе расположения установочного носителя. Validating install media '/data/iso/zentyal-3.2-amd64.iso' failed: 'NoneType' object has no attribute 'get_disk_type'
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/create.py", line 1820, in _validate_install_page
    self._guest.installer.location = location
  File "/usr/share/virt-manager/virtinst/installer.py", line 80, in set_location
    self._location = self._validate_location(val)
  File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 193, in _validate_location
    (str(val), e))
ValueError: Validating install media '/data/iso/zentyal-3.2-amd64.iso' failed: 'NoneType' object has no attribute 'get_disk_type'

dpkg -l | grep qemu
rc aqemu 0.8.2-2build1 amd64 Qt4 front-end for QEMU and KVM
ii ipxe-qemu 1.0.0+git-20150424.a25a16d-1ubuntu1.2 all PXE boot firmware - ROM images for qemu
ii qemu 1:2.5+dfsg-5ubuntu10.29 amd64 fast processor emulator
ii qemu-block-extra:amd64 1:2.5+dfsg-5ubuntu10.29 amd64 extra block backend modules for qemu-system and qemu-utils
ii qemu-kvm 1:2.5+dfsg-5ubuntu10.29 amd64 QEMU Full virtualization
ii qemu-slof 20151103+dfsg-1ubuntu1.1 all Slimline Open Firmware -- QEMU PowerPC version
ii qemu-system 1:2.5+dfsg-5ubuntu10.29 ...