我跟着这教程但失败了。
更新/升级命令后我收到很多PHP not found found错误，但我仍然希望 Stretch 能够取代 PHP 内容。
现在sudo apt-get update出现以下错误：
W: There is no public key available for the following key IDs:
112695A0E562B32A
W: There is no public key available for the following key IDs:
648ACFD622F3D138
W: Failed to fetch https://packages.sury.org/php/dists/jessie/main/binary-amd64/Packages HttpError404
E: Some index files failed to download. They have been ignored, or old ones used instead.
sudo apt-get update出现以下错误：
E: Failed to fetch https://packages.sury.org/php/pool/main/p/pcre3/libpcre3_8.43-1+0~20200703.7+debian8~1.gbpbfc49f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/libssl-doc_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_all.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/libssl-dev_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/libssl1.1_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/openssl_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php-defaults/php-common_76+0~20200511.26+debian8~1.gbpc9beb6_all.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php-pear/php-pear_1.10.8+submodules+notgz-1+0~20190219091008.9+jessie~1.gbp1a209a_all.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_all.deb HttpError404
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
sudo apt-get dist-upgrade：
WARNING: The following packages cannot be authenticated!
libidn2-0 libpcre3 libssl-doc libssl-dev libssl1.1 openssl libicu65 libxml2 php-common php7.3-intl php7.3-readline php7.3-mysql php7.3-bcmath php7.3-gd php7.3-xml php7.3-opcache php7.3-curl php7.3-json php7.3-cgi php7.3-bz2
php7.3-mbstring php7.3-zip php7.3-cli libapache2-mod-php7.3 php7.3-common php-pear php7.3
Install these packages without verification? [y/N] y
Get:1 https://packages.sury.org/php/ jessie/main libidn2-0 amd64 2.2.0-2+0~20200302.4+debian8~1.gbpf85c2e [128 kB]
Err https://packages.sury.org/php/ jessie/main libidn2-0 amd64 2.2.0-2+0~20200302.4+debian8~1.gbpf85c2e
HttpError404
Get:2 https://packages.sury.org/php/ jessie/main libpcre3 amd64 2:8.43-1+0~20200703.7+debian8~1.gbpbfc49f [339 kB]
Err https://packages.sury.org/php/ jessie/main libpcre3 amd64 2:8.43-1+0~20200703.7+debian8~1.gbpbfc49f
HttpError404
Get:3 https://packages.sury.org/php/ jessie/main libssl-doc all 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f [1775 kB]
Err https://packages.sury.org/php/ jessie/main libssl-doc all 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f
HttpError404
Get:4 https://packages.sury.org/php/ jessie/main libssl-dev amd64 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f [1802 kB]
Err https://packages.sury.org/php/ jessie/main libssl-dev amd64 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f
HttpError404
Get:5 https://packages.sury.org/php/ jessie/main libssl1.1 amd64 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f [1550 kB]
Err https://packages.sury.org/php/ jessie/main libssl1.1 amd64 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f
HttpError404
Get:6 https://packages.sury.org/php/ jessie/main openssl amd64 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f [834 kB]
Err https://packages.sury.org/php/ jessie/main openssl amd64 1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f
HttpError404
Get:7 https://packages.sury.org/php/ jessie/main libicu65 amd64 65.1-1+0~20200223.8+debian8~1.gbp519cf3 [8453 kB]
Err https://packages.sury.org/php/ jessie/main libicu65 amd64 65.1-1+0~20200223.8+debian8~1.gbp519cf3
HttpError404
Get:8 https://packages.sury.org/php/ jessie/main libxml2 amd64 2.9.9+dfsg-1+0~20200226.5+debian8~1.gbp3b6674 [730 kB]
Err https://packages.sury.org/php/ jessie/main libxml2 amd64 2.9.9+dfsg-1+0~20200226.5+debian8~1.gbp3b6674
HttpError404
Get:9 https://packages.sury.org/php/ jessie/main php-common all 2:76+0~20200511.26+debian8~1.gbpc9beb6 [16.0 kB]
Err https://packages.sury.org/php/ jessie/main php-common all 2:76+0~20200511.26+debian8~1.gbpc9beb6
HttpError404
Get:10 https://packages.sury.org/php/ jessie/main php7.3-intl amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1 [124 kB]
Err https://packages.sury.org/php/ jessie/main php7.3-intl amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1
HttpError404
Get:11 https://packages.sury.org/php/ jessie/main php7.3-readline amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1 [12.2 kB]
Err https://packages.sury.org/php/ jessie/main php7.3-readline amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1
HttpError404
Get:12 https://packages.sury.org/php/ jessie/main php7.3-mysql amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1 [118 kB]
Err https://packages.sury.org/php/ jessie/main php7.3-mysql amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1
HttpError404
Get:13 https://packages.sury.org/php/ jessie/main php7.3-bcmath amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1 [15.2 kB]
Err https://packages.sury.org/php/ jessie/main php7.3-bcmath amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1
HttpError404
Get:14 https://packages.sury.org/php/ jessie/main php7.3-gd amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1 [27.4 kB]
Err https://packages.sury.org/php/ jessie/main php7.3-gd amd64 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1
Get:27 https://packages.sury.org/php/ jessie/main php7.3 all 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1 [44.1 kB]
Err https://packages.sury.org/php/ jessie/main php7.3 all 7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1
HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/libi/libidn2/libidn2-0_2.2.0-2+0~20200302.4+debian8~1.gbpf85c2e_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/pcre3/libpcre3_8.43-1+0~20200703.7+debian8~1.gbpbfc49f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/libssl-doc_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_all.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/libssl-dev_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/libssl1.1_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/o/openssl/openssl_1.1.1g-1+0~20200421.17+debian8~1.gbpf6902f_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/i/icu/libicu65_65.1-1+0~20200223.8+debian8~1.gbp519cf3_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/libx/libxml2/libxml2_2.9.9+dfsg-1+0~20200226.5+debian8~1.gbp3b6674_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php-defaults/php-common_76+0~20200511.26+debian8~1.gbpc9beb6_all.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-intl_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-readline_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-mysql_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-bcmath_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-gd_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-xml_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-opcache_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-curl_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-json_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-cgi_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-bz2_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-mbstring_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-zip_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-cli_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/libapache2-mod-php7.3_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3-common_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_amd64.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php-pear/php-pear_1.10.8+submodules+notgz-1+0~20190219091008.9+jessie~1.gbp1a209a_all.deb HttpError404
E: Failed to fetch https://packages.sury.org/php/pool/main/p/php7.3/php7.3_7.3.19-1+0~20200612.60+debian8~1.gbp6c8fe1_all.deb HttpError404
cat /etc/apt/sources.list：
#deb http://debian.mirrors.ovh.net/debian/ jessie main
#deb-src http://debian.mirrors.ovh.net/debian/ jessie main
#deb http://security.debian.org/ jessie/updates main
#deb-src http://security.debian.org/ jessie/updates main
#jessie-updates, previously known as 'volatile'
#deb http://debian.mirrors.ovh.net/debian/ jessie-updates main
#deb-src http://debian.mirrors.ovh.net/debian/ jessie-updates main
#jessie-backports, previously on backports.debian.org
#deb http://debian.mirrors.ovh.net/debian/ jessie-backports main
#deb-src http://debian.mirrors.ovh.net/debian/ jessie-backports main
#deb http://debian.mirrors.ovh.net/debian/ jessie main contrib non-free
#deb-src http://debian.mirrors.ovh.net/debian/ jessie main contrib non-free
#deb http://software.virtualmin.com/gpl/debian/ virtualmin-jessie main
#deb http://software.virtualmin.com/gpl/debian/ virtualmin-universal main
#ruti
#deb http://ftp.us.debian.org/debian jessie-backports main contrib non-free
#ruti2
#deb ftp://ftp.us.debian.org/debian/ wheezy non-free
#deb http://security.debian.org/ wheezy/updates non-free
#deb http://deb.debian.org/debian/ jessie main
#deb http://security.debian.org/ jessie/updates main
#Only these are uncommented below
deb http://deb.debian.org/debian/ stretch main
deb http://security.debian.org/debian-security stretch/updates main
deb http://deb.debian.org/debian/ stretch-updates main
cat /etc/os-release：
PRETTY_NAME="Debian GNU/Linux 8 (jessie)"
NAME="Debian GNU/Linux"
VERSION_ID="8"
VERSION="8 (jessie)"
ID=debian
HOME_URL="http://www.debian.org/"
SUPPORT_URL="http://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
我的目标是将 Debian 8 升级到 10，但第一步是升级到 9。如果您能帮助我，我会很高兴！
答案1
删除 sources.list.d/ 下的 php.list 有效。