当我安装 Selenium 时，出现以下错误：
Shubham@Shubham-To-be-filled-by-O-E-M:~$ sudo apt-get update
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]
Hit:2 https://repo.skype.com/deb stable InRelease
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease
Get:4 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Get:5 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Fetched 323 kB in 8s (38.6 kB/s)
Reading package lists... Done
Shubham@Shubham-To-be-filled-by-O-E-M:~$ sudo pip install selenium
Traceback (most recent call last):
File "/usr/bin/pip", line 9, in <module>
from pip import main
ImportError: cannot import name main
我应该如何进行？