Unable to complete install: 'Requested operation is not valid: network 'default' is not active

Good day to you all. I tried to install winapps using Virtual Machine Manager, however, after I clicked Begin Installation, it showed me this error

Unable to complete install: 'Requested operation is not valid: network 'default' is not active'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/createvm.py", line 2001, in _do_async_install
    installer.start_install(guest, meter=meter)
  File "/usr/share/virt-manager/virtinst/install/installer.py", line 701, in start_install
    domain = self._create_guest(
  File "/usr/share/virt-manager/virtinst/install/installer.py", line 649, in _create_guest
    domain = self.conn.createXML(install_xml or final_xml, 0)
  File "/usr/lib/python3.9/site-packages/libvirt.py", line 4376, in createXML
    raise libvirtError('virDomainCreateXML() failed')
libvirt.libvirtError: Requested operation is not valid: network 'default' is not active

sudo virsh net-list --all

 Name      State      Autostart   Persistent
----------------------------------------------
 default   inactive   yes          yes

sudo virsh net-start default

error: Failed to start network default
error: internal error: Failed to initialize a valid firewall backend

What should I do to fix this?

neofetch

██████████████████  ████████   soumi@Hori 
██████████████████  ████████   ---------- 
██████████████████  ████████   OS: Manjaro Linux x86_64 
██████████████████  ████████   Host: Aspire A514-53 V1.16 
████████            ████████   Kernel: 5.14.7-2-MANJARO 
████████  ████████  ████████   Uptime: 5 hours, 52 mins 
████████  ████████  ████████   Packages: 1428 (pacman) 
████████  ████████  ████████   Shell: bash 5.1.8 
████████  ████████  ████████   Resolution: 1366x768 
████████  ████████  ████████   DE: Plasma 5.22.5 
████████  ████████  ████████   WM: KWin 
████████  ████████  ████████   Theme: Breeze Light [Plasma], Breeze [GTK2/3] 
████████  ████████  ████████   Icons: breeze [Plasma], breeze [GTK2/3] 
████████  ████████  ████████   Terminal: konsole 
                               CPU: Intel i3-1005G1 (4) @ 3.400GHz 
                               GPU: Intel Iris Plus Graphics G1 
                               Memory: 4762MiB / 7630MiB 

inxi -Fazy

System:
  Kernel: 5.14.7-2-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.14-x86_64 
  root=UUID=3e711149-8ebe-45af-8e9a-78a1cdacff3f rw quiet apparmor=1 
  security=apparmor resume=UUID=d27dc7f4-ce4f-48b8-ba69-9971d9cc4ca0 
  udev.log_priority=3 
  Desktop: KDE Plasma 5.22.5 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM 
  Distro: Manjaro Linux base: Arch Linux 
Machine:
  Type: Laptop System: Acer product: Aspire A514-53 v: V1.16 serial: <filter> 
  Chassis: type: 10 serial: <filter> 
  Mobo: IL model: Sneezy_IL v: V1.16 serial: <filter> UEFI: Insyde v: 1.16 
  date: 01/18/2021 
Battery:
  ID-1: BAT0 charge: 10.7 Wh (33.8%) condition: 31.7/53.0 Wh (59.9%) 
  volts: 16.0 min: 15.4 model: PANASONIC KT004 AP19B5L type: Li-ion 
  serial: <filter> status: Charging cycles: 386 
CPU:
  Info: Dual Core model: Intel Core i3-1005G1 bits: 64 type: MT MCP 
  arch: Ice Lake family: 6 model-id: 7E (126) stepping: 5 microcode: A6 cache: 
  L2: 4 MiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 9524 
  Speed: 2567 MHz min/max: 400/3400 MHz Core speeds (MHz): 1: 2567 2: 2543 
  3: 2525 4: 2745 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Enhanced IBRS, IBPB: conditional, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: Intel Iris Plus Graphics G1 vendor: Acer Incorporated ALI 
  driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:8a56 class-ID: 0300 
  Device-2: Chicony HD User Facing type: USB driver: uvcvideo bus-ID: 1-6:4 
  chip-ID: 04f2:b64f class-ID: 0e02 serial: <filter> 
  Display: x11 server: X.Org 1.20.13 compositor: kwin_x11 driver: 
  loaded: modesetting alternate: fbdev,vesa display-ID: :0 screens: 1 
  Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0") 
  s-diag: 414mm (16.3") 
  Monitor-1: eDP-1 res: 1366x768 hz: 60 dpi: 112 size: 309x173mm (12.2x6.8") 
  diag: 354mm (13.9") 
  OpenGL: renderer: Mesa Intel UHD Graphics (ICL GT1) v: 4.6 Mesa 21.2.2 
  direct render: Yes 
Audio:
  Device-1: Intel Ice Lake-LP Smart Sound Audio vendor: Acer Incorporated ALI 
  driver: snd_hda_intel v: kernel alternate: snd_sof_pci_intel_icl 
  bus-ID: 00:1f.3 chip-ID: 8086:34c8 class-ID: 0401 
  Device-2: C-Media USB PnP Sound Device type: USB 
  driver: hid-generic,snd-usb-audio,usbhid bus-ID: 1-4:9 chip-ID: 0d8c:013a 
  class-ID: 0300 
  Sound Server-1: ALSA v: k5.14.7-2-MANJARO running: yes 
  Sound Server-2: sndio v: N/A running: no 
  Sound Server-3: JACK v: 1.9.19 running: no 
  Sound Server-4: PulseAudio v: 15.0 running: yes 
  Sound Server-5: PipeWire v: 0.3.37 running: yes 
Network:
  Device-1: Intel Ice Lake-LP PCH CNVi WiFi driver: iwlwifi v: kernel 
  port: 4000 bus-ID: 00:14.3 chip-ID: 8086:34f0 class-ID: 0280 
  IF: wlp0s20f3 state: up mac: <filter> 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Acer Incorporated ALI driver: r8169 v: kernel port: 3000 
  bus-ID: 01:00.0 chip-ID: 10ec:8168 class-ID: 0200 
  IF: enp1s0 state: down mac: <filter> 
Bluetooth:
  Device-1: Intel AX201 Bluetooth type: USB driver: btusb v: 0.8 
  bus-ID: 1-10:5 chip-ID: 8087:0026 class-ID: e001 
  Report: rfkill ID: hci0 rfk-id: 1 state: down bt-service: N/A rfk-block: 
  hardware: no software: no address: see --recommends 
RAID:
  Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci 
  v: 3.0 port: 4060 bus-ID: 00:17.0 chip-ID: 8086.282a rev: 30 class-ID: 0104 
  Device-1: md126 maj-min: 9:126 type: mdraid level: N/A status: inactive 
  size: N/A 
  Info: report: N/A blocks: 2136 chunk-size: N/A 
  Components: Online: N/A Spare: 
  0: nvme0n1 maj-min: 259:0 size: 476.94 GiB state: S 
  Device-2: md127 maj-min: 9:127 type: mdraid level: N/A status: inactive 
  size: N/A 
  Info: report: N/A blocks: 2944 chunk-size: N/A 
  Components: Online: N/A Spare: 
  0: nvme1n1 maj-min: 259:5 size: 27.25 GiB state: S 
Drives:
  Local Storage: total: 1.4 TiB used: 190.83 GiB (13.3%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Intel model: HBRPEKNX0202A 
  size: 476.94 GiB block-size: physical: 512 B logical: 512 B speed: 15.8 Gb/s 
  lanes: 2 type: SSD serial: <filter> rev: G002 temp: 27.9 C 
  ID-2: /dev/nvme1n1 maj-min: 259:5 vendor: Intel model: HBRPEKNX0202AO 
  size: 27.25 GiB block-size: physical: 512 B logical: 512 B speed: 15.8 Gb/s 
  lanes: 2 type: SSD serial: <filter> rev: K5110440 temp: 30.9 C 
  ID-3: /dev/sda maj-min: 8:0 vendor: Seagate model: ST1000LM048-2E7172 
  size: 931.51 GiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  type: HDD rpm: 5400 serial: <filter> rev: 0001 scheme: MBR 
Partition:
  ID-1: / raw-size: 400 GiB size: 392.65 GiB (98.16%) used: 78.25 GiB (19.9%) 
  fs: ext4 dev: /dev/sda2 maj-min: 8:2 
  ID-2: /boot/efi raw-size: 512 MiB size: 511 MiB (99.80%) 
  used: 816 KiB (0.2%) fs: vfat dev: /dev/sda4 maj-min: 8:4 
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default) 
  ID-1: swap-1 type: partition size: 8 GiB used: 183.2 MiB (2.2%) priority: -2 
  dev: /dev/sda3 maj-min: 8:3 
Sensors:
  System Temperatures: cpu: 54.0 C mobo: N/A 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 219 Uptime: 5h 52m wakeups: 1 Memory: 7.45 GiB 
  used: 4.89 GiB (65.6%) Init: systemd v: 249 tool: systemctl Compilers: 
  gcc: 11.1.0 Packages: apt: 0 pacman: 1428 lib: 402 flatpak: 0 Shell: Zsh 
  v: 5.8 default: Bash v: 5.1.8 running-in: konsole inxi: 3.3.06

If you want to use the NAT backend you need to install some extra dependencies.

https://archlinux.org/packages/community/x86_64/libvirt/

You need at least dnsmasq and an ebtables provider. etables is in Arch provided by iptables-nft which will conflict with the normal iptables package. You will need to replace iptables with iptables-nft .

Faced the same problem.

if the following command shows default profile and the state is inactive

sudo virsh net-list --all  

then try,

sudo virsh net-start default
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