由於 deb.sury PHP PPA，無法將 Debian Jessie 升級到穩定版

我正在嘗試按照本教程將我的 Linode Jessie 實例升級到穩定版。我已經升級了我的/etc/apt/sources.list文件，並且已經完成了這$ sudo apt update一步。當我輸入該命令時，我得到以下資訊：

Hit http://mirrors.linode.com stable InRelease
Hit http://mirrors.linode.com stable-updates InRelease                         
Ign http://nyc2.mirrors.digitalocean.com stable InRelease                      
Hit http://archive.debian.org jessie-backports InRelease                       
Ign http://nyc2.mirrors.digitalocean.com stable Release.gpg                    
Ign http://nyc2.mirrors.digitalocean.com stable Release                        
Get:1 http://security.debian.org stable/updates InRelease [39.1 kB]            
Get:2 https://packages.sury.org stable InRelease                        
Ign https://packages.sury.org stable InRelease                                 
Get:3 http://mirrors.linode.com stable/main Sources [7,827 kB]                 
W: There is no public key available for the following key IDs:                 
648ACFD622F3D138
NO_PUBKEY DCC9EFBF77E11517
W: There is no public key available for the following key IDs:
648ACFD622F3D138
E: Release file for http://archive.debian.org/debian/dists/jessie-backports/InRelease is expired (invalid since 145d 4h 29min 16s). Updates for this repository will not be applied.

我前面提到/etc/apt/sources.list的文件是：

# 

# deb cdrom:[Debian GNU/Linux 8.3.0 _Jessie_ - Official Multi-architecture amd6$

#deb cdrom:[Debian GNU/Linux 8.3.0 _Jessie_ - Official Multi-architecture amd64$

deb http://mirrors.linode.com/debian/ stable main
deb-src http://mirrors.linode.com/debian/ stable main

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

# jessie-updates, previously known as 'volatile'
deb http://mirrors.linode.com/debian/ stable-updates main
deb [arch=i386,ppc64el,amd64] http://nyc2.mirrors.digitalocean.com/mariadb/repo/10.2/debian stable main
# deb-src [arch=i386,ppc64el,amd64] http://nyc2.mirrors.digitalocean.com/mariadb/repo/10.2/debian stable main

deb-src http://mirrors.linode.com/debian/ stable-updates main

在對 PPA 進行一些研究時，我還將我的 `/etc/apt/sources.list.d/php.list 文件更新為：

deb https://packages.sury.org/php/ stable main

但錯誤仍然存在。

有沒有辦法升級這個 PPA 以便它可以與 Debian Stable 一起使用？還是有其他方法可以解決這個問題？

您只是缺少簽名密鑰；新版本中的軟體包使用新密鑰進行簽名。您可以從密鑰伺服器獲取密鑰並將它們保存為新文件/etc/apt/trusted.gpg.d/：

$ sudo gpg --no-default-keyring --keyring gnupg-ring:/etc/apt/trusted.gpg.d/debian-archive-buster-automatic.gpg --keyserver keyserver.ubuntu.com --recv 648ACFD622F3D138
gpg: keyring '/etc/apt/trusted.gpg.d/debian-archive-buster-automatic.gpg' created
gpg: key DC30D7C23CBBABEE: public key "Debian Archive Automatic Signing Key (10/buster) <ftpmaster@debian.org>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1

$ sudo gpg --no-default-keyring --keyring gnupg-ring:/etc/apt/trusted.gpg.d/debian-archive-buster-stable.gpg --keyserver keyserver.ubuntu.com --recv DCC9EFBF77E11517
gpg: keyring '/etc/apt/trusted.gpg.d/debian-archive-buster-stable.gpg' created
gpg: key DCC9EFBF77E11517: public key "Debian Stable Release Key (10/buster) <debian-release@lists.debian.org>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1

如果這些文件的權限是別的東西，請將它們更改為-rw-r--r--使用：

sudo chmod 644 /etc/apt/trusted.gpg.d/debian-archive-buster-automatic.gpg
sudo chmod 644 /etc/apt/trusted.gpg.d/debian-archive-buster-stable.gpg

現在應該在apt-key list& 的輸出中列出這些鍵，並修復錯誤apt update。

引用自：https://serverfault.com/questions/975262