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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.