這里有一臺(tái)國(guó)內(nèi)的云服務(wù)器重新部署Web環(huán)境，但是默認(rèn)的是Debian官方源，安裝軟件的時(shí)候比較慢。這里我考慮將更換成國(guó)內(nèi)鏡像源。比如我們常用的源鏡像包括騰訊云、阿里云、華為云登。這里我直接按照慣例將Debian的源更換。

修改配置：

/etc/apt/sources.list

我將里面的文件替換：

deb https://mirrors.cloud.tencent.com/debian/ buster main contrib non-free
deb https://mirrors.cloud.tencent.com/debian/ buster-updates main contrib non-free
deb https://mirrors.cloud.tencent.com/debian/ buster-backports main contrib non-free
deb https://mirrors.cloud.tencent.com/debian-security buster/updates main contrib non-free
deb-src https://mirrors.cloud.tencent.com/debian/ buster main contrib non-free
deb-src https://mirrors.cloud.tencent.com/debian/ buster-updates main contrib non-free
deb-src https://mirrors.cloud.tencent.com/debian/ buster-backports main contrib non-free
deb-src https://mirrors.cloud.tencent.com/debian-security buster/updates main contrib non-free

替換完畢之后，執(zhí)行命令。

apt update -y

不過(guò)在執(zhí)行后有錯(cuò)誤提示。

我開(kāi)始以為是騰訊云源的問(wèn)題，于是我更換成阿里云和華為云的Debian源也是如此。

華為云Debian源：

deb https://mirrors.huaweicloud.com/debian/ buster main contrib non-free
deb https://mirrors.huaweicloud.com/debian/ buster-updates main contrib non-free
deb https://mirrors.huaweicloud.com/debian/ buster-backports main contrib non-free
deb https://mirrors.huaweicloud.com/debian-security/ buster/updates main contrib non-free
deb-src https://mirrors.huaweicloud.com/debian/ buster main contrib non-free
deb-src https://mirrors.huaweicloud.com/debian/ buster-updates main contrib non-free
deb-src https://mirrors.huaweicloud.com/debian/ buster-backports main contrib non-free

阿里云Debian源：

deb http://mirrors.aliyun.com/debian/ buster main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster main non-free contrib
deb http://mirrors.aliyun.com/debian-security buster/updates main
deb-src http://mirrors.aliyun.com/debian-security buster/updates main
deb http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib

然后執(zhí)行后依舊有問(wèn)題。

E: The repository 'https://***/debian buster-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.

都會(huì)看到這個(gè)錯(cuò)誤，看來(lái)問(wèn)題是一樣的，換源不能解決問(wèn)題。

其實(shí)較多的問(wèn)題都集中在buster-backports文件上，是不是這個(gè)源URL有問(wèn)題，那我們將這個(gè)源更換成Debian源，其他不變是不是就可以解決。

將有"buster-backports main contrib non-free"的行的內(nèi)容換成Debian源的。

deb http://archive.debian.org/debian buster-backports main contrib non-free
deb-src http://archive.debian.org/debian buster-backports main contrib non-free

然后我們?cè)賵?zhí)行 ：

apt update && apt upgrade

問(wèn)題是可以得到解決的。