@koba

ifconfig shows that ethernet has nothing. wg0 is for WireGuard. wlps0 is for my phone's hotspot as only way I can connect to internet either wired or wirelessly. Wired connection normally showing by clicking on top right hand corner of screen has again disappeared! I disconnected phone's hotspot in between 1st & 2nd ifcnofig:

john@Desktop:~$ ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 2459061  bytes 185774876 (185.7 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2459061  bytes 185774876 (185.7 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wg0: flags=209<UP,POINTOPOINT,RUNNING,NOARP>  mtu 1420
        inet 10.0.0.1  netmask 255.255.255.0  destination 10.0.0.1
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 15  dropped 0 overruns 0  carrier 0  collisions 0

wlp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.203.1  netmask 255.255.255.0  broadcast 192.168.203.255
        inet6 fe80::c01f:1a40:87b9:30b5  prefixlen 64  scopeid 0x20<link>
        ether bc:f1:71:6d:25:4f  txqueuelen 1000  (Ethernet)
        RX packets 943830  bytes 1085877280 (1.0 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 486094  bytes 69901150 (69.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

john@Desktop:~$ ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 2462191  bytes 186047466 (186.0 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2462191  bytes 186047466 (186.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wg0: flags=209<UP,POINTOPOINT,RUNNING,NOARP>  mtu 1420
        inet 10.0.0.1  netmask 255.255.255.0  destination 10.0.0.1
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 15  dropped 0 overruns 0  carrier 0  collisions 0

john@Desktop:~$ sudo lshw -C network
[sudo] password for john: 
  *-network UNCLAIMED       
       description: Ethernet controller
       product: RTL8125 2.5GbE Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 05
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list
       configuration: latency=0
       resources: ioport:f000(size=256) memory:fe900000-fe90ffff memory:fe910000-fe913fff
  *-network DISABLED
       description: Wireless interface
       product: Wi-Fi 6 AX200
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlp3s0
       version: 1a
       serial: bc:f1:71:6d:25:4f
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.19.0-43-generic firmware=72.daa05125.0 cc-a0-72.ucode latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:67 memory:fe800000-fe803fff
john@Desktop:~$ rfkill list
0: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no
1: phy0: Wireless LAN
	Soft blocked: yes
	Hard blocked: no
john@Desktop:~$ rfkill unblock all
john@Desktop:~$ rfkill list
0: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no
1: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no
john@Desktop:~$ ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 2462473  bytes 186069134 (186.0 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2462473  bytes 186069134 (186.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wg0: flags=209<UP,POINTOPOINT,RUNNING,NOARP>  mtu 1420
        inet 10.0.0.1  netmask 255.255.255.0  destination 10.0.0.1
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 15  dropped 0 overruns 0  carrier 0  collisions 0

john@Desktop:~$ sudo lshw -C network
  *-network UNCLAIMED       
       description: Ethernet controller
       product: RTL8125 2.5GbE Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 05
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list
       configuration: latency=0
       resources: ioport:f000(size=256) memory:fe900000-fe90ffff memory:fe910000-fe913fff
  *-network DISABLED
       description: Wireless interface
       product: Wi-Fi 6 AX200
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlp3s0
       version: 1a
       serial: bc:f1:71:6d:25:4f
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.19.0-43-generic firmware=72.daa05125.0 cc-a0-72.ucode latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:67 memory:fe800000-fe803fff
Are there any packages which I can reinstall (or even purge & install) which are used for connection to a router? 

BTW I have a an old Pentium laptop also on Ubuntu 22.04 which works Ok still. The only thing that I can think of that is causing these issues is that sometimes my PC freezes (and I don't know why) which gives rise to some orphaned inodes on rebooting. I've even tried a TP-Link usb wifi dongle but that doesn't connect either on this Asus barebones PN50-1 computer but works OK on my old Pentium laptop.