No internet connection - Ubuntu 18.04

I use Ubuntu since 2 months and I had a problem this morning I could not fix. I have tried many solutions on forums but none worked so far. I hope I will find any help here as I need this computer to work.

Issue : Network card is not detected, I do not have access to Wi-Fi, audio and bluetooth. I only have "dummy output" as audio output.

Clue : I tried to fix an issue with Ubuntu giving me black screen when computer was put in suspension. To do so I switched my Nvidia driver from 470 to Nouveau. Also I played with the file /etc/default/grub but I think I did not make any permanent change on the end. [Irrelevant]

Some commands I typed that may be relevant:

lspci -k -nn | grep -A 3 -i net:

(base) castaing@castaing-OMEN-by-HP-Laptop:~$ lspci -k -nn | grep -A 3 -i net 
    04:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 61)
        Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5010]
    05:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
        Subsystem: Hewlett-Packard Company RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [103c:825d]

ip a :

(base) castaing@castaing-OMEN-by-HP-Laptop:~$ ip a
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
        inet 127.0.0.1/8 scope host lo
           valid_lft forever preferred_lft forever
        inet6 ::1/128 scope host 
           valid_lft forever preferred_lft forever
    (base) castaing@castaing-OMEN-by-HP-Laptop:~$ 

Modprobe :

  (base) castaing@castaing-OMEN-by-HP-Laptop:~$ sudo modprobe 8169
    modprobe: FATAL: Module 8169 not found in directory /lib/modules/5.4.0-80-generic
 
  (base) castaing@castaing-OMEN-by-HP-Laptop:~$ sudo modprobe r8169
modprobe: FATAL: Module r8169 not found in directory /lib/modules/5.4.0-80-generic

 
(base) castaing@castaing-OMEN-by-HP-Laptop:~$ sudo modprobe 8168
    modprobe: FATAL: Module 8168 not found in directory /lib/modules/5.4.0-80-generic


(base) castaing@castaing-OMEN-by-HP-Laptop:~$ sudo modprobe iwlwifi
modprobe: ERROR: ../libkmod/libkmod-module.c:832 kmod_module_insert_module() could not find module by name='iwlwifi'
modprobe: ERROR: could not insert 'iwlwifi': Unknown symbol in module, or unknown parameter (see dmesg)

Content of the file /etc/default/grub thay may be realted to the issue:

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

Update: I found a temporary solution: it turned out the problem was the last update with the installation of a new Linux version 5.4.0.80. With the Advanced Ubuntu option in the boot menu I managed to start with Linux 5.4.0.77 (generic version) and now my Internet is back. However when running dmesg command I still have some errors shown below :

[    0.416717] platform MSFT0101:00: failed to claim resource 1: [mem 0xfed40000-0xfed40fff]
[    0.416721] acpi MSFT0101:00: platform device creation failed: -16
[   17.812417] Bluetooth: hci0: unexpected event for opcode 0xfc2f
[   46.580144] nouveau 0000:01:00.0: secboot: HS load failed, ret 0x0000002c
[   46.580152] nouveau 0000:01:00.0: gr: init failed, -22

I did a boot repair but nothing changed