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I posted the same question a while ago, I deleted the last one and opened a new one because I have new information which could be of use

I currently have a partition on my laptop on which I installed ubuntu,the only problem is that for some reason when I try to turn on the Wi-Fi, it says "Wi-Fi adapter not found". With an ethernet cable it runs without any problem.

The thing is, that I really need to be able to connect to the Wi-Fi when am attending University, hence it's an urgent matter for me.

Now I have tried several suggestions (thanks to the helpful community), however nothing worked yet. Tips that I have tried were to run rfkill unblock all, it still says my Wi-Fi is hard blocked.

0: phy0: Wireless LAN

    Soft blocked: no

    Hard blocked: yes

1: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

output lspci -knn | grep Net -A3; rfkill list gives:

04:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 59)

    Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5010]

    Kernel driver in use: iwlwifi

    Kernel modules: iwlwifi

0: phy0: Wireless LAN

    Soft blocked: no

    Hard blocked: yes

1: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

and output dmesg | grep iwl

[   10.047575] iwlwifi 0000:04:00.0: can't find IRQ for PCI INT A; please try using pci=biosirq

[   10.104633] iwlwifi 0000:04:00.0: loaded firmware version 29.1044073957.0 op_mode iwlmvm

[   10.194732] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 7265, REV=0x210

[   10.201931] iwlwifi 0000:04:00.0: reporting RF_KILL (radio disabled)

[   10.215295] iwlwifi 0000:04:00.0: base HW address: e4:42:a6:5b:96:bd

[   10.255264] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'

[   11.355172] iwlwifi 0000:04:00.0 wlo1: renamed from wlan0

furthermore, I did reset my BIOS which didn't change the situation. Suggestions where to look in the BIOS whether the adapter is disabled. (But in Windows the Wi-Fi works perfectly), I have a picture of this:

Lastly, one suggestion was to look for a key on my laptop that enables/disables the Wi-Fi adapter, as far as I know I can't find one.
My laptop is a HP Pavilion Power 15-cb091nd.

For any additional information/questions let me know! thanks for your time!

EDIT: Airplane mode is off, I tried booting to another kernel, both no results

Partial answer...

1. Look at the version of BIOS that you have installed. If it's not F.17 Rev.A (Dec 10, 2018) then go to the HP Support Site and download this BIOS update and install it. Reset the BIOS back to factory defaults... leaving Secure Boot disabled, if required. Retest wireless.



2. 
   

   Try the latest stable kernel 4.20.xx. First... BACKUP YOUR COMPUTER... AT LEAST THE UBUNTU PART (see my note, below, about Timeshift), then install ukuu.

   
   
   
   
   

   • sudo apt update # update the software databases

   
   

   • sudo apt install ukuu # install Kernel Update Utility for Ubuntu

   
   

   • Start ukuu and install kernel 4.20.xx and retest wireless.

   
   
   
   

Note: to backup your Ubuntu OS (only) so you can easily restore... install Timeshift...

For those who don't know what Timeshift is...

The closest thing to a Windows-like restore point is by using Timeshift. I use it to save snapshots to an external USB hard drive. Although it can, it's normally not used for backing up your /home directory, just system-level changes. Use Backups (Déjà Dup) for backing up /home files.

Timeshift is a system restore utility which takes snapshots

of the system at regular intervals. These snapshots can be restored

at a later date to undo system changes. Creates incremental snapshots

using rsync or BTRFS snapshots using BTRFS tools.

More information at https://github.com/teejee2008/timeshift

Add the PPA and install with:

sudo add-apt-repository -y ppa:teejee2008/ppa

sudo apt update

sudo apt install timeshift