deb http://mirrors.aliyun.com/ubuntu bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu bionic-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ bionic partner
deb https://mirrors.tuna.tsinghua.edu.cn/linuxmint tricia main upstream import backport
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ bionic partner