Ytdyklly

After installing ubuntu 18.08 LTS along side with windows 10 , i encountered some problems using ubuntu the first is the touchpad but thanks to askubuntu i corrected the problem.
Now i'm searching solutions to another problem that is with my wifi wireless connection it doesn't work and more over when entering to wifi settings i see an No Wifi Adapter Found' i already tried some stuff but unluckily not working.
when typingsudo lshw -C network` i get this :

  *-network                 

       description: Ethernet interface

       product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller

       vendor: Realtek Semiconductor Co., Ltd.

       physical id: 0

       bus info: pci@0000:01:00.0

       logical name: enp1s0

       version: 07

       serial: 98:29:a6:67:23:2b

       capacity: 100Mbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp aui bnc mii fibre 10bt 10bt-fd 100bt 100bt-fd autonegotiation

       configuration: autonegotiation=on broadcast=yes driver=r8169 firmware=rtl8106e-1_0.0.1 06/29/12 latency=0 link=no multicast=yes port=MII

       resources: irq:16 ioport:4000(size=256) memory:b1200000-b1200fff memory:b1000000-b1003fff

  *-network UNCLAIMED

       description: Network controller

       product: Realtek Semiconductor Co., Ltd.

       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 bus_master cap_list

       configuration: latency=0

       resources: ioport:3000(size=256) memory:b1100000-b110ffff

  *-network

       description: Ethernet interface

       physical id: 3

       logical name: enp0s20f0u2

       serial: 22:2e:f7:46:24:ff

       capabilities: ethernet physical

       configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.91 link=yes multicast=yes

When typing `lspci -knn | grep Net -A02:00.0 i get :

02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]

    Subsystem: Lenovo RTL8821CE 802.11ac PCIe Wireless Network Adapter [17aa:c024]

    Kernel modules: wl

When trying rfkill list i get :

0: ideapad_wlan: Wireless LAN

    Soft blocked: no

    Hard blocked: no

1: ideapad_bluetooth: Bluetooth

    Soft blocked: no

    Hard blocked: no

3: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

Help please i want back my wireless connection

I recently got a laptop with that wifi card. Tried several guides and drivers to make it work. The easiest way (and best in my opinion, as there is a driver version around the web with a bug which after you disconnect from a network and then reconnect, it fails, you have to disable and enable wifi to be able to connect again) is to download and install the driver from this deb package:
https://launchpad.net/~wenchien/+archive/ubuntu/rtl8821c/+files/oem-wifi-realtek-8821ce-lp1767920-4.15-dkms_0.8_amd64.deb
Source: https://bugs.launchpad.net/ubuntu/+source/linux-oem/+bug/1740231
You will need an active internet connection to install the driver, since it will pull some packages from the Ubuntu repos.

Edit:

My apologies. You will need an active internet connection until the wifi driver is installed (ethernet cable or, if you have bluetooth, you can share from your phone or tablet connected to wifi). Instructions are for a 64bit machine. Open a Terminal and type:

sudo apt update  

This will fetch available packages in the repositories, but it will not update your system, you can do that later after fixing the wifi issue.

wget "https://launchpad.net/~wenchien/+archive/ubuntu/rtl8821c/+files/oem-wifi-realtek-8821ce-lp1767920-4.15-dkms_0.8_amd64.deb"  

This downloads the driver in form of a .deb package from a PPA.

sudo apt install ./oem-wifi-realtek-8821ce-lp1767920-4.15-dkms_0.8_amd64.deb  

Installs the downloaded driver, downloading the required package dependencies first.

exit  

Reboot and, after login, you should be able to see, connect and disconnect from available wifi networks. Hope that helps