换源 (清华大学源)

vim /etc/apt/sources.list

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy main restricted universe multiverse
# deb-src <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy main restricted universe multiverse
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy-updates main restricted universe multiverse
# deb-src <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy-updates main restricted universe multiverse
deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy-backports main restricted universe multiverse
# deb-src <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy-backports main restricted universe multiverse

deb <http://ports.ubuntu.com/ubuntu-ports/> jammy-security main restricted universe multiverse
# deb-src <http://ports.ubuntu.com/ubuntu-ports/> jammy-security main restricted universe multiverse

# 预发布软件源，不建议启用
# deb <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy-proposed main restricted universe multiverse
# # deb-src <https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/> jammy-proposed main restricted universe multiverse

需要注意，树莓派是 ARM 架构的，需要使用 ubuntu-ports 镜像。

如果在运行 apt update 后报一下错误，说明你用错成了 X86/X64 架构的镜像