確認下系統版本是否是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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總結

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