Internet Connection Problems in Ubuntu 20.04

I took a vps server to ubuntu to use it as a rdp. I connected to it via ssh, installed ubuntu-desktop and xRDP. I managed to connect to it, but the Internet does not work on it - there are no available connections. Sometimes, after rebooting, I can do something from the terminal, for example, sudo apt, but most often it just gives errors like this when entering via ssh: Failed to connect to lts. Check your Internet connection or proxy settings. When I try to check the ping to 8.8.8.8, the packets go through. Last time I tried, I was able to download the speedtest-cli package, it shows good speed. But there is no Internet inside the interface. I am new to linux and this is a very unexpected behavior for me. I really count on your help. print screen #1 print screen #2print screen #3