写入：
直接复制即可！
c
cat > /etc/apt/sources.list <<'EOF'
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie main contrib non-free non-free-firmware
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-updates main contrib non-free non-free-firmware
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-backports main contrib non-free non-free-firmware
deb https://security.debian.org/debian-security trixie-security main contrib non-free non-free-firmware
EOF更新：
c
apt update结果：
cpp
root@anjuxi:~# cat > /etc/apt/sources.list <<'EOF'
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie main contrib non-free non-free-firmware
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-updates main contrib non-free non-free-firmware
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-backports main contrib non-free non-free-firmware
deb https://security.debian.org/debian-security trixie-security main contrib non-free non-free-firmware
EOF
root@anjuxi:~# apt update
Hit:1 https://mirrors.tuna.tsinghua.edu.cn/debian trixie InRelease
Hit:2 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-updates InRelease
Get:3 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports InRelease [54.0 kB]
Get:4 https://security.debian.org/debian-security trixie-security InRelease [43.4 kB]
Get:5 https://security.debian.org/debian-security trixie-security/main amd64 Packages [270 kB]
Get:6 https://security.debian.org/debian-security trixie-security/main Translation-en [167 kB]
Get:7 https://security.debian.org/debian-security trixie-security/contrib amd64 Packages [3,152 B]
Get:8 https://security.debian.org/debian-security trixie-security/contrib Translation-en [2,564 B]
Get:9 https://security.debian.org/debian-security trixie-security/non-free-firmware amd64 Packages [544 B]
Get:10 https://security.debian.org/debian-security trixie-security/non-free-firmware Translation-en [352 B]
Get:11 https://mirrors.tuna.tsinghua.edu.cn/debian trixie/contrib amd64 Packages [53.9 kB]
Get:12 https://mirrors.tuna.tsinghua.edu.cn/debian trixie/contrib Translation-en [49.6 kB]
Get:13 https://mirrors.tuna.tsinghua.edu.cn/debian trixie/non-free amd64 Packages [100 kB]
Get:14 https://mirrors.tuna.tsinghua.edu.cn/debian trixie/non-free Translation-en [67.1 kB]
Get:15 https://mirrors.tuna.tsinghua.edu.cn/debian trixie/non-free-firmware amd64 Packages [6,884 B]
Get:16 https://mirrors.tuna.tsinghua.edu.cn/debian trixie/non-free-firmware Translation-en [4,704 B]
Get:17 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main amd64 Packages [294 kB]
Get:18 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main Translation-en [230 kB]
Get:19 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/contrib amd64 Packages [7,976 B]
Get:20 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/contrib Translation-en [7,712 B]
Get:21 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/non-free amd64 Packages [7,952 B]
Get:22 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/non-free Translation-en [6,384 B]
Get:23 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/non-free-firmware amd64 Packages [6,756 B]
Get:24 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/non-free-firmware Translation-en [4,568 B]
Fetched 909 kB in 4s (216 kB/s)
73 packages can be upgraded. Run 'apt list --upgradable' to see them.