Debian 來源錯誤

當我嘗試在 Chromebook 上更新我的包（安裝了 Linux）時，我這樣做：sudo apt-get update，它給了我這個錯誤：

Ign:1 https://deb.debian.org/debian stretch InRelease
Ign:2 https://deb.debian.org/debian-security stretch/updates InRelease
Err:3 https://deb.debian.org/debian stretch Release

Err:4 https://deb.debian.org/debian-security stretch/updates Release

Reading package lists... Done
E: The repository 'https://deb.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 'https://deb.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.

因此，我不再能夠在終端中安裝軟體包（和/或更新）。

有什麼建議麼？

PS：不僅在我更新時，當我嘗試安裝 Firefox 時，我使用了sudo apt-get install firefox-esr. 但它給了我這個：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
 fonts-stix | otf-stix fonts-lmodern
The following NEW packages will be installed:
 firefox-esr
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 42.4 MB of archives.
After this operation, 164 MB of additional disk space will be used.
Err:1 https://deb.debian.org/debian-security stretch/updates/main amd64 firefox-esr amd64 60.6.1esr-1~deb9u1

E: Failed to fetch https://deb.debian.org/debian-security/pool/updates/main/f/firefox-esr/firefox-esr_60.6.1esr-1~deb9u1_amd64.deb  
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

請注意，我不是在質疑如何安裝 firefox，我想修復錯誤。

另外：當我輸入時ls /etc/apt/sources.list它只返回/etc/apt/sources.list。當我輸入lsb_release -a它返回：

No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 9.8 (stretch)
Release:        9.8
Codename:       stretch

當我輸入cat /etc/*-release它返回：

PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

最後，當我打字時cat /proc/version，它說：

Linux version 4.19.16-02893-g2cf2c17c8a43 (chrome-bot@swarm-cros-729) (Chromium OS 8.0_pre349610_p20190109-r3 clang version 8.0.0 (/var/cache/chromeos-cache/distfiles/host/egit-src/clang.git a1a49a7b666a6a9d9b55b52602f9773a9e00b4f5) (/var/cache/chromeos-cache/distfiles/host/egit-src/llvm.git 331ffd31b3dd49b3f02a27556938b836b679f564) (based on LLVM 8.0.0svn)) #1 SMP PREEMPT Sat Jan 19 09:52:07 PST 2019

當我喜歡它時/etc/apt/sources.list，它會給我：

deb https://deb.debian.org/debian stretch main
deb https://deb.debian.org/debian-security stretch/updates main

最後兩天后，LiveWireBT和kemotep的許多影片和信任對我幫助很大。所以問題是我的來源被刪除了/etc/apt/sources.list，解決方案是重新添加所有來源。我通過執行以下命令來做到這一點：

vi /etc/apt/sources.list

然後我輸入[ESC]&cl然後將其中的所有內容替換為：

deb http://deb.debian.org/debian/ stable main contrib non-free
deb-src http://deb.debian.org/debian/ stable main contrib non-free

deb http://deb.debian.org/debian/ stable-updates main contrib non-free
deb-src http://deb.debian.org/debian/ stable-updates main contrib non-free

deb http://deb.debian.org/debian-security stable/updates main
deb-src http://deb.debian.org/debian-security stable/updates main

deb http://ftp.debian.org/debian stretch-backports main
deb-src http://ftp.debian.org/debian stretch-backports main

然後我必須使用 - 按鈕退出ESC，然後鍵入:wq! sudo保存並退出。之後，我使用更新了我的軟體包sudo apt-get update && sudo apt-get upgrade，之後一切正常。

引用自：https://unix.stackexchange.com/questions/512164