树莓派3b ubuntu18.04-mate apt update慢 解决方案

修改 /etc/apt/sources.list

sudo vim /etc/apt/sources.list

用dd将改行删除，在i右键，将内容更改为：

deb http://ports.ubuntu.com/ubuntu-ports bionic main restricted
deb-src http://ports.ubuntu.com/ubuntu-ports bionic main restricted

deb http://ports.ubuntu.com/ubuntu-ports bionic-updates main restricted
deb-src http://ports.ubuntu.com/ubuntu-ports bionic-updates main restricted

deb http://ports.ubuntu.com/ubuntu-ports bionic universe
deb-src http://ports.ubuntu.com/ubuntu-ports bionic universe
deb http://ports.ubuntu.com/ubuntu-ports bionic-updates universe
deb-src http://ports.ubuntu.com/ubuntu-ports bionic-updates universe

deb http://ports.ubuntu.com/ubuntu-ports bionic multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports bionic multiverse
deb http://ports.ubuntu.com/ubuntu-ports bionic-updates multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports bionic-updates multiverse

deb http://ports.ubuntu.com/ubuntu-ports bionic-backports main restricted universe multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports bionic-backports main restricted universe multiverse

deb http://ports.ubuntu.com/ubuntu-ports bionic-security main restricted
deb-src http://ports.ubuntu.com/ubuntu-ports bionic-security main restricted
deb http://ports.ubuntu.com/ubuntu-ports bionic-security universe
deb-src http://ports.ubuntu.com/ubuntu-ports bionic-security universe
deb http://ports.ubuntu.com/ubuntu-ports bionic-security multiverse
deb-src http://ports.ubuntu.com/ubuntu-ports bionic-security multiverse

再在vim中

:%s/ports.ubuntu.com/mirrors.aliyun.com/g
:wq