-network UNCLAIMED description: Network controller product: RTL8723DE 802.11b/g/n PCIe Adapter

After upgrading to Ubuntu 21.10, my wifi not showing up.

Output of following command

sudo lshw -C network 
  *-network                 
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eno1
       version: 15
       serial: b4:b6:86:0f:79:a1
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.048.03-NAPI duplex=full ip=192.168.1.11 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:126 ioport:4000(size=256) memory:b1104000-b1104fff memory:b1100000-b1103fff
  *-network UNCLAIMED
       description: Network controller
       product: RTL8723DE 802.11b/g/n PCIe Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress cap_list
       configuration: latency=0
       resources: ioport:3000(size=256) memory:b1000000-b100ffff

Saw this result after some googling: https://ubuntuhandbook.org/index.php/2021/01/install-rtl8188eu-rtl8723ds-drivers-ppa-ubuntu-20-04/

Though this guide says it's for 20.04, the PPA page suggests that this PPA works for Impish (21.10) too.

Connect to the internet via ethernet, which seems to be working according to your lshw, and run:

sudo add-apt-repository ppa:kelebek333/kablosuz
sudo apt update
sudo apt install rtl8723de-dkms