I have a DSL internet connection. The DSL is just a cable that comes into my house, no routers under my control. For a long time the internet functioned fine in Ubuntu using the default Network Manager. Recently however, my ISP was bought by another ISP, and the service name had to be changed in the DSL settings. In Windows, it connects without any issue whatsoever, only the service name change was required... But in Ubuntu, the first time I connect I get a "Apache: Not Found" page, the next time, I get to the previous ISP's login page, it continues like this for some time until I get it working. I have to try connecting it again and again.
When I asked the customer service, they said that because of the takeover, they have switched servers. But they said, it should work properly in Windows, and they were clueless about Ubuntu. Is there anything I can do to solve this issue?