Internet not working (Showing ethernet logo):

Internet not working (Showing ethernet logo):

Problem:
The Internet is not working, but the default server of the router or modem is working and showing the ethernet logo.

A common issue that is related to the problem:
Using a VPN e.g.: Proton VPN and disconnecting from the native system option or removing the VPN information from the default settings app which causes an error.

Solution:
1) Open the terminal app
2) Type the network manager command line commands "nmcli connection show" and press enter button
3) It will present the connection names with UUID, types, and device

e.g.:
NAME                      UUID                                  TYPE      DEVICE
Consistent                c04b967a-91b2-4714-845f-5eabb20fe843  wifi      wlp18s0f0u5
pvpn-ipv6leak-protection  9fa124f1-ebd0-4e44-8387-6343884d2a31  dummy     ipv6leakintrf0
lo                        f55060d1-9a6d-4765-8bfa-ab454889ae9f  loopback  lo
Redmi 9i                  55532e8d-58a4-4dcc-b7b7-4b2bed035224  wifi      --
Wired connection 1        e1a00b9c-c739-3d5b-bee2-063bdaf7b985  ethernet  --
Wired connection 2        218131ea-e7df-30ed-a993-bcf77659dd11  ethernet  --

4) Just check how many connections are real and how many are dummies and VPNs are listed in green color with the help of TYPE section

e.g.:
pvpn-ipv6leak-protection    9fa124f1-ebd0-4e44-8387-6343884d2a31  dummy     ipv6leakintrf0

5) Copy and disconnect the dummy connections using this command
nmcli con down id "CONNECTION_NAME"

e.g.:
nmcli con down id "pvpn-ipv6leak-protection"

6) Now open up the VPN application in my case the application is  Proton VPN
7) Connect to the VPN and then disconnect the VPN