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Here is some information:

lspci log:

00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 08)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #1 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)
00:1c.6 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #7 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Intel(R) 100 Series Chipset Family LPC Controller/eSPI Controller - 9D4E (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 3D controller: NVIDIA Corporation GP108M [GeForce MX150] (rev a1)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8822BE 802.11a/b/g/n/ac WiFi adapter
03:00.0 Non-Volatile memory controller: Sandisk Corp Device 5005 (rev 01)

rfkill list all:

0: ideapad_wlan: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: ideapad_bluetooth: Bluetooth
    Soft blocked: yes
    Hard blocked: no
2: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no
3: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

lshw -class network

  *-network                 
       description: Wireless interface
       product: RTL8822BE 802.11a/b/g/n/ac WiFi adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0
       version: 00
       serial: 80:2b:f9:b5:bd:63
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=r8822be driverversion=4.15.0-52-generic firmware=N/A ip=192.168.43.174 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:137 ioport:3000(size=256) memory:a4100000-a410ffff
  *-network
       description: Ethernet interface
       physical id: 3
       logical name: enp0s20f0u3
       serial: 62:a0:67:1e:24:c7
       capabilities: ethernet physical
       configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.44 link=yes multicast=yes

The laptop is Lenovo Ideapad 530s. It was preinstalled with Windows 10. I've dual booted it with Elementary OS Juno.

Secure boot is disabled. I've searched and tried lots of options that were present in various forums in vain. If there is any more information required, please ask.

closed as off-topic by Hasan Jun 24 at 19:54

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "The Question is about a release or feature that has been significantly updated, to the point at which upgrading fixes the issue or answers the question." – Hasan
If this question can be reworded to fit the rules in the help center, please edit the question.

0

I just updated the AppCenter and was frustated that this question wasn't getting enough attention and when I restarted my laptop and somehow it got working on its own.

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