ubuntu18.10 cosmic更换阿里云的源

确认下系统版本是否是cosmic:

(python3.6) appleyuchi@ubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID:   Ubuntu
Description:   Ubuntu 18.10
Release:   18.10
Codename:   cosmic

deb http://mirrors.aliyun.com/ubuntu/ cosmic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ cosmic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ cosmic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ cosmic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ cosmic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ cosmic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ cosmic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ cosmic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ cosmic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ cosmic-backports main restricted universe multiverse

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