I have bought a new laptop and downloaded the latest LTS version of Ubuntu. When I tried to install the dual boot for the first time, it failed, then after adding "nomodeset" to the grub menu I managed to install the same. But after installation there is no gui brightness control as well as the brightness button is not working. I tried a lot of methods to fix this, but none worked. Bellow is my system info:

System:    Host: pkrakesh-HP-Pavilion-Gaming-Laptop-15-cx0xxx Kernel: 4.15.0-43-generic x86_64
           bits: 64 gcc: 7.3.0
           Desktop: Gnome 3.28.2 (Gtk 3.22.30-1ubuntu1) dm: gdm3
           Distro: Ubuntu 18.04.1 LTS
Machine:   Device: laptop System: HP product: HP Pavilion Gaming Laptop 15-cx0xxx v: Type1ProductConfigId serial: N/A
           Mobo: HP model: 8478 v: 70.39 serial: N/A
           UEFI: Insyde v: F.11 date: 08/13/2018
           Chassis: type: 10 serial: N/A
Battery    BAT1: charge: 48.7 Wh 96.0% condition: 50.8/52.8 Wh (96%)
           volts: 13.2/11.6
           model: Hewlett-Packard PABAS0241231 serial: 41167 status: Charging
CPU:       Quad core Intel Core i5-8300H (-MT-MCP-) arch: Skylake rev.10
           speed/max: 900/4000 MHz
Graphics:  Card-1: Intel Device 3e9b bus-ID: 00:02.0 chip-ID: 8086:3e9b
           Card-2: NVIDIA GP107M [GeForce GTX 1050 Mobile]
           bus-ID: 01:00.0 chip-ID: 10de:1c8d
           Display Server: x11 (X.Org 1.19.6 )
           drivers: fbdev (unloaded: modesetting,vesa)
           Resolution: 1920x1080@77.00hz
           OpenGL: renderer: llvmpipe (LLVM 6.0, 256 bits)
           version: 3.3 Mesa 18.0.5 (compat-v: 3.0) Direct Render: Yes
Network:   Card-1: Intel Device a370
           driver: iwlwifi bus-ID: 00:14.3 chip-ID: 8086:a370
           Card-2: Realtek RTL8111/8168/8411 PCIE Gigabit Ethernet Controller
           driver: r8169 v: 2.3LK-NAPI port: 3000
           bus-ID: 03:00.0 chip-ID: 10ec:8168
Drives:    HDD Total Size: 1000.2GB (0.8% used)
Info:      Processes: 309 Uptime: 20 min Memory: 1738.6/7865.9MB
           Init: systemd v: 237 runlevel: 5 Gcc sys: N/A
           Client: Shell (bash 4.4.191 running in gnome-terminal-) inxi: 2.3.56 
-------------------------------------

And my grub looks likes this:

System:    Host: pkrakesh-HP-Pavilion-Gaming-Laptop-15-cx0xxx Kernel: 4.15.0-43-generic x86_64
           bits: 64 gcc: 7.3.0
           Desktop: Gnome 3.28.2 (Gtk 3.22.30-1ubuntu1) dm: gdm3
           Distro: Ubuntu 18.04.1 LTS
Machine:   Device: laptop System: HP product: HP Pavilion Gaming Laptop 15-cx0xxx v: Type1ProductConfigId serial: N/A
           Mobo: HP model: 8478 v: 70.39 serial: N/A
           UEFI: Insyde v: F.11 date: 08/13/2018
           Chassis: type: 10 serial: N/A
Battery    BAT1: charge: 48.7 Wh 96.0% condition: 50.8/52.8 Wh (96%)
           volts: 13.2/11.6
           model: Hewlett-Packard PABAS0241231 serial: 41167 status: Charging
CPU:       Quad core Intel Core i5-8300H (-MT-MCP-) arch: Skylake rev.10
           speed/max: 900/4000 MHz
Graphics:  Card-1: Intel Device 3e9b bus-ID: 00:02.0 chip-ID: 8086:3e9b
           Card-2: NVIDIA GP107M [GeForce GTX 1050 Mobile]
           bus-ID: 01:00.0 chip-ID: 10de:1c8d
           Display Server: x11 (X.Org 1.19.6 )
           drivers: fbdev (unloaded: modesetting,vesa)
           Resolution: 1920x1080@77.00hz
           OpenGL: renderer: llvmpipe (LLVM 6.0, 256 bits)
           version: 3.3 Mesa 18.0.5 (compat-v: 3.0) Direct Render: Yes
Network:   Card-1: Intel Device a370
           driver: iwlwifi bus-ID: 00:14.3 chip-ID: 8086:a370
           Card-2: Realtek RTL8111/8168/8411 PCIE Gigabit Ethernet Controller
           driver: r8169 v: 2.3LK-NAPI port: 3000
           bus-ID: 03:00.0 chip-ID: 10ec:8168
Drives:    HDD Total Size: 1000.2GB (0.8% used)
Info:      Processes: 309 Uptime: 20 min Memory: 1738.6/7865.9MB
           Init: systemd v: 237 runlevel: 5 Gcc sys: N/A
           Client: Shell (bash 4.4.191 running in gnome-terminal-) inxi: 2.3.56 
------------------------
If there is any way to fix this, it'll be great. Thanks