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I have recently a purchased Lenovo Thinkpad E480 laptop, I have installed Ubuntu 18.04 on it, everything is working fine except am not able to connect to network via WiFi. Please help.

I followed this link, but am unable to solve the issue.

Below are the outputs of some commands.

lsb_release -a

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic

uname -r

4.15.0-33-generic

rfkill list all

0: tpacpi_bluetooth_sw: Bluetooth
 Soft blocked: no
 Hard blocked: no
1: hci0: Bluetooth
 Soft blocked: no
 Hard blocked: no

lspci -nnk | grep 0280 -A3

05:00.0 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]
06:00.0 SD Host controller [0805]: O2 Micro, Inc. SD/MMC Card Reader Controller [1217:8621] (rev 01)
 Subsystem: Lenovo SD/MMC Card Reader Controller [17aa:5068]

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@0000:03:00.0
 logical name: enp3s0
 version: 10
 serial: 8c:16:45:a3:d9:f1
 size: 100Mbit/s
 capacity: 1Gbit/s
 width: 64 bits
 clock: 33MHz
 capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
 configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168g-3_0.0.1 04/23/13 ip=192.168.2.2 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
 resources: irq:16 ioport:d000(size=256) memory:f1204000-f1204fff memory:f1200000-f1203fff
 *-network UNCLAIMED
 description: Network controller
 product: Realtek Semiconductor Co., Ltd.
 vendor: Realtek Semiconductor Co., Ltd.
 physical id: 0
 bus info: pci@0000:05:00.0
 version: 00
 width: 64 bits
 clock: 33MHz
 capabilities: pm msi pciexpress cap_list
 configuration: latency=0
 resources: ioport:c000(size=256) memory:f1100000-f110ffff

It seems I have to clone, compile and install the required WiFi driver, please guide me which WiFi driver to use and how to install (with steps if possible).

P.S.: Let me know if any further information is needed to solve this issue, I will add the required info (if any) in the question as per the guidance given.

With a temporary working internet connection by ethernet, tethered or any other means, open a terminal Ctrl+Alt+t and do:

sudo apt update
sudo apt install build-essential git dkms
git clone https://github.com/tomaspinho/rtl8821ce.git
cd rtl8821ce
sudo ./dkms-install.sh

The file builds for me on my 18.04 system with a few possibly harmless warnings but no errors.

Follow with:

sudo modprobe 8821ce

You should be all set.