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. My "/etc/apt/sources.list" file is: deb http://ftp.us.debian.org/debian/ stretch main contrib non-free deb-src http://ftp.us.debian.org/debian/ stretch main contrib non-free deb http://security.debian.org/debian-security stretch/updates main contrib non-free deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free # stretch-updates, previously known as 'volatile' deb http://ftp.us.debian.org/debian/ stretch-updates main contrib non-free deb-src http://ftp.us.debian.org/debian/ stretch-updates main contrib non-free My other debian 9 machines with same sources.list file have no problems so I guess it must be related to the change of static IP. But I cannot figure out what is wrong. I have tried "apt clean" but it did help. Thank you very much! Michael
