다른 국가로 이사 한 후 아무것도 업데이트하거나 설치할 수 없습니다.

며칠 전에 PC에 Ubuntu를 설치했는데 모든 것이 잘 작동합니다.
다른 나라로 여행을 갔는데 아직 거기에 있습니다. 따라서 업데이트를 실행하거나 Ubuntu Software에서 무엇이든 설치하려고 할 때마다 인터넷이 잘 작동하고 PC를 사용하여 인터넷에 액세스 할 수 있지만 아무 것도 작동하지 않습니다 (지금이 줄을 작성하는 데 사용하고 있습니다).
현재 내가있는 국가의 서버 중 하나로 서버를 변경하려고했지만 작동하지 않았습니다. 그래서 우분투 메인 서버로 변경했지만 작동하지 않았습니다.
내 PC, 실행을 다시 시작 sudo apt autoclean하고 sudo apt clean, 아무것도 변경되지 않습니다.
업데이트 프로세스를 실행할 때마다 여전히 이러한 오류가 발생합니다.

sudo apt update
Ign:1 http://archive.canonical.com/ubuntu bionic InRelease
Err:2 http://archive.canonical.com/ubuntu bionic Release
  404  Not Found [IP: 91.189.92.191 80]
Ign:3 http://archive.ubuntu.com/ubuntu bionic InRelease
Ign:4 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Ign:5 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Ign:6 http://archive.ubuntu.com/ubuntu bionic-security InRelease
Err:7 http://archive.ubuntu.com/ubuntu bionic Release
  404  Not Found [IP: 91.189.88.174 80]
Err:8 http://archive.ubuntu.com/ubuntu bionic-updates Release
  404  Not Found [IP: 91.189.88.174 80]
Err:9 http://archive.ubuntu.com/ubuntu bionic-backports Release
  404  Not Found [IP: 91.189.88.174 80]
Err:10 http://archive.ubuntu.com/ubuntu bionic-security Release
  404  Not Found [IP: 91.189.88.174 80]
Reading package lists... Done
E: The repository 'http://archive.canonical.com/ubuntu bionic Release' no longer has 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://archive.ubuntu.com/ubuntu bionic Release' does not 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://archive.ubuntu.com/ubuntu bionic-updates Release' does not 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://archive.ubuntu.com/ubuntu bionic-backports Release' does not 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://archive.ubuntu.com/ubuntu bionic-security Release' does not 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.

누구든지 이것을 고치는 방법을 알고 있습니까?

편집 :
문제는 .NET 에 올바른 링크 가 없다는 것이 아닙니다/etc/apt/sources.list . 내 문제는 내가 업데이트를 실행하면 터미널에 표시되는 링크가 나는에있는 것과 유사하지 않은 것입니다 /etc/apt/sources.list내가 업데이트 또한시 /etc/apt/sources.list로 Raffa가 말했다, 나는 아직도 유사한 오류를 얻을.

sudo apt update 
Ign:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Ign:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Ign:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Err:4 http://security.ubuntu.com/ubuntu bionic-security Release
  404  Not Found [IP: 91.189.91.14 80]
Err:5 http://archive.ubuntu.com/ubuntu bionic Release
  404  Not Found [IP: 91.189.88.31 80]
Err:6 http://archive.ubuntu.com/ubuntu bionic-updates Release
  404  Not Found [IP: 91.189.88.31 80]
Reading package lists... Done
E: The repository 'http://security.ubuntu.com/ubuntu bionic-security Release' no longer has 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://archive.ubuntu.com/ubuntu bionic Release' does not 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://archive.ubuntu.com/ubuntu bionic-updates Release' does not 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.

Raffa가/etc/apt/sources.list 언급 한 링크가 포함되어 있지만

cat /etc/apt/sources.list
deb http://archive.ubuntu.com/ubuntu bionic main universe multiverse restricted
deb http://security.ubuntu.com/ubuntu/ bionic-security main multiverse universe restricted
deb http://archive.ubuntu.com/ubuntu bionic-updates main multiverse universe restricted