installation problems
 

Hello everyone!
After typing the command
sudo apt-get update


After sometime it ends with these commands shown below


Reading package lists... Done
E: The repository 'http://security.ubuntu.com/ubuntu zesty-security Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu zesty Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu zesty-updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu zesty-backports Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.






Can someone help?
BTW I have tried using 2 different INTERNET connections with same result.

Hi,
your question is not OpenFOAM related, so you'd better ask the it at Ubuntu forum, not here.

Alas - still we can learn an important skill crucial for OpenFOAM operation. It is reading the error message properly.

In your case, it says the release file does not exist, not that the internet connection is faulty.
You should upgrade the whole distribution I guess.

Good luck and come back with some OpenFOAM questions.