Linux执行apt update && apt upgrage提示the public key is not available问题解决

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在执行apt update && apt upgrade后，报错信息如下：

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Err:5 https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABA1F9B8875A6661
Reading package lists... Done
W: GPG error: https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABA1F9B8875A6661
E: The repository 'https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version InRelease' is not signed.
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.

意思是由于公钥不可用，因此无法验证以下签名。下面已经过时不可用！

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys --recv ABA1F9B8875A6661

正确的解法是:

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ls -al /etc/apt/sources.list.d/

otal 20
drwxr-xr-x 2 root root 4096 Mar 14 21:47 ./
drwxr-xr-x 8 root root 4096 Mar 14 21:56 ../
-rw-r--r-- 1 root root  449 Oct  7 14:48 caddy-stable.list
-rw-r--r-- 1 root root  113 Sep  8  2024 docker.list
-rw-r--r-- 1 root root   94 Mar 14 21:47 spotify.list

导入公钥并生成 keyring 文件, 对于 Caddy 仓库:

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curl -fsSL https://dl.cloudsmith.io/public/caddy/stable/gpg.key | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg

确认 keyring 文件存在:

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ls /usr/share/keyrings/caddy-stable-archive-keyring.gpg

修改 Caddy 的源文件：

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vim /etc/apt/sources.list.d/caddy-stable.list

保持一致即可：

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# Source: Caddy
# Site: https://github.com/caddyserver/caddy
# Repository: Caddy / stable
# Description: Fast, multi-platform web server with automatic HTTPS


deb [signed-by=/usr/share/keyrings/caddy-stable-archive-keyring.gpg] https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version main

deb-src [signed-by=/usr/share/keyrings/caddy-stable-archive-keyring.gpg] https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version main

遇到Spotify的报错：

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Get:7 https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version/main amd64 Packages [3,947 B]
Reading package lists... Done
W: GPG error: https://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C85668DF69375001
E: The repository 'http://repository.spotify.com stable InRelease' is not signed.
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.

编辑文件 ⁠/etc/apt/sources.list.d/spotify.list，将原内容：
deb [signed-by=/usr/share/keyrings/spotify.gpg] http://repository.spotify.com stable non-free
修改为：
deb [trusted=yes] http://repository.spotify.com stable non-free
保存后执行：
apt update

只是有个警告,其他正常：

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1 package can be upgraded. Run 'apt list --upgradable' to see it.
W: http://repository.spotify.com/dists/stable/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.