Ethernet connection stop working after installing updated from "Software updater"

After installing updates recommended by "software updater" my internet stopped working. But It work when I boot using live disk image.

When I run the live image I can see "wired connection" under settings -> network tab.

I've tried following solutions, please don't mark this question as a duplicate.

1. https://askubuntu.com/a/1342203/1568463
2. Ubuntu 18.04 missing wired connections in settings
3. https://askubuntu.com/a/1103263

Apart from this in couple of other similar question people have sugested to update/install net-tool and other packages. But I was not able to perform those operations because system is not connected to internet.

Most of these questions had comments asking to execute some command and report back the output. Here are output for those commands.

uname -r
5.13.0-28-generic

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

nmcli con show

NAME                UUID                                  TYPE      DEVICE 
Wired connection 1  01a40650-9c01-35f6-9453-aed0993f63fc  ethernet  --     

nmcli con up Wired\ connection\ 1 

Error: Connection activation failed: No suitable device found for this connection (device lo not available because device is strictly unmanaged).

lsb_release -a
No LSB modules are available.
Distributor ID:   Ubuntu
Description:   Ubuntu 20.04 LTS
Release: 20.04
Codename:   focal

lshw -C network
WARNING: you should run this program as super-user.
  *-network UNCLAIMED       
       description: Ethernet controller
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:22:00.0
       version: 15
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list
       configuration: latency=0
       resources: ioport:f000(size=256) memory:f7504000-f7504fff memory:f7500000-f7503fff

lspci -nn | grep -i ethernet

22:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)

sudo dmidecode -s bios-version
3.07