When I try to install INET 4.0 on fresh Linux Mint 19 installation with OMNET++ v5.4.1 there is an error message like this:
When I try to reach the download address from command line with
mentioned at error screen I can download the INET 4.0 .tgz file.
Also I checked if I could reach internet by pinging.
How can I find what causes this? Any answers are welcome!