Dear friends,
I need some help here. I worked in a university and have a linux (debian 9) machine with DHCP. For some reason I needed a static IP and two weeks ago the university sent someone who helped me set up the static IP. From what I saw the file they modified is the "/etc/network/interfaces".
However, I found that now I cannot update/install packages. "apt update" stuck at "0% [Waiting for headers]" for a long time and then give the following message:
Ign:1
http://security.debian.org/debian-security stretch/updates InRelease
Ign:2
http://ftp.us.debian.org/debian stretch InRelease
Err:3
http://security.debian.org/debian-security stretch/updates Release
Connection failed [IP: 151.101.50.132 80]
Ign:4
http://ftp.us.debian.org/debian stretch-updates InRelease
Err:5
http://ftp.us.debian.org/debian stretch Release
Connection failed [IP: 128.61.240.89 80]
Err:6
http://ftp.us.debian.org/debian stretch-updates Release
Connection failed [IP: 128.61.240.89 80]
Reading package lists... Done
E: The repository '
http://security.debian.org/debian-security stretch/updates 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.
E: The repository '
http://ftp.us.debian.org/debian stretch 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.
E: The repository '
http://ftp.us.debian.org/debian stretch-updates 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.
"apt list package_name" still gives information about the package, but "apt install package_name" is stuck at "0% [Waiting for headers]".
The internet connection has no problem. DNS seems fine as well. I can ping for example
security.debian.org or 8.8.8.8.