Wifi being picky on my laptop

[daenys2000]

I've been a Linux mint(cinnamon) user for almost 6 months. For some unknown reason, the Wifi doesn't connect at all to my hostel's public Wifi network. There must not be anything wrong with that network because my android phone and windows 10(on the same laptop) connect to that network without any issue. My laptop can still connect to my phone's hotspot but it simply fails to connect to this particular network. I have searched a lot but I found no post describing the problem I am facing, I tried setting Ipv6 to "Ignore" as suggested by some thread here(on a similar problem) but that does not help.
My system specifications are as follows:

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Kernel: 4.15.0-54-generic x86_64 bits: 64 
Desktop: Cinnamon 4.0.10 Distro: Linux Mint 19.1 Tessa 

[athi]

Posted system specifications is a bit short. Please run below command to output more detailed system information.

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inxi -Fxz

[daenys2000]

okay, this is the output:

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System:
  Host: nitisha-HP-Laptop Kernel: 4.15.0-54-generic x86_64 bits: 64 
  compiler: gcc v: 7.4.0 Desktop: Cinnamon 4.0.10 
  Distro: Linux Mint 19.1 Tessa base: Ubuntu 18.04 bionic 
Machine:
  Type: Laptop System: HP product: HP Laptop 15-bs0xx 
  v: Type1ProductConfigId serial: <filter> 
  Mobo: HP model: 832A v: 23.51 serial: <filter> UEFI: Insyde v: F.36 
  date: 03/30/2018 
Battery:
  ID-1: BAT1 charge: 11.7 Wh condition: 39.5/41.6 Wh (95%) 
  model: Hewlett-Packard PABAS0241231 status: Discharging 
CPU:
  Topology: Dual Core model: Intel Core i3-7020U bits: 64 type: MT MCP 
  arch: Kaby Lake rev: A L2 cache: 3072 KiB 
  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 18432 
  Speed: 798 MHz min/max: 400/2300 MHz Core speeds (MHz): 1: 925 2: 895 
  3: 1045 4: 935 
Graphics:
  Device-1: Intel HD Graphics 620 vendor: Hewlett-Packard driver: i915 
  v: kernel bus ID: 00:02.0 
  Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa 
  resolution: 1920x1080~60Hz 
  OpenGL: renderer: Mesa DRI Intel HD Graphics 620 (Kaby Lake GT2) 
  v: 4.5 Mesa 19.0.2 direct render: Yes 
Audio:
  Device-1: Intel Sunrise Point-LP HD Audio vendor: Hewlett-Packard 
  driver: snd_hda_intel v: kernel bus ID: 00:1f.3 
  Sound Server: ALSA v: k4.15.0-54-generic 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Hewlett-Packard driver: r8169 v: 2.3LK-NAPI port: 4000 
  bus ID: 01:00.0 
  IF: eno1 state: down mac: <filter> 
  Device-2: Realtek vendor: Hewlett-Packard driver: rtl8723de v: kernel 
  port: 3000 bus ID: 02:00.0 
  IF: wlo1 state: down mac: <filter> 
  Device-3: Samsung GT-I9070 (network tethering USB debugging enabled) 
  type: USB driver: rndis_host bus ID: 1-2:10 
  IF: enp0s20f0u2 state: unknown speed: N/A duplex: N/A mac: <filter> 
Drives:
  Local Storage: total: 931.51 GiB used: 73.03 GiB (7.8%) 
  ID-1: /dev/sda vendor: Western Digital model: WD10JPVX-60JC3T1 
  size: 931.51 GiB 
Partition:
  ID-1: / size: 377.37 GiB used: 72.96 GiB (19.3%) fs: ext4 dev: /dev/sda7 
Sensors:
  System Temperatures: cpu: 41.5 C mobo: 29.8 C 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 250 Uptime: 20h 36m Memory: 3.77 GiB used: 1.99 GiB (52.7%) 
  Init: systemd runlevel: 5 Compilers: gcc: 7.4.0 Shell: bash v: 4.4.20 
  inxi: 3.0.27 

[athi]

Your HP laptop uses Realtek rtl8723de wifi.

Below is link to Pjotr excellent tutorial on Realtek wifi drivers installation:
https://easylinuxtipsproject.blogspot.c ... altek.html