Ubuntu升级Python3版本后pip无法使用

输入pip命令后结果如下

caros@ubuntu:~$ pip3
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Python path configuration:
  PYTHONHOME = (not set)
  PYTHONPATH = ':/home/caros/otaclient/:/home/caros/secure_upgrade/python/'
  program name = '/usr/bin/python3'
  isolated = 0
  environment = 1
  user site = 1
  import site = 1
  sys._base_executable = '/usr/bin/python3'
  sys.base_prefix = '/usr/local/python3'
  sys.base_exec_prefix = '/usr/local/python3'
  sys.executable = '/usr/bin/python3'
  sys.prefix = '/usr/local/python3'
  sys.exec_prefix = '/usr/local/python3'
  sys.path = [
    '',
    '/home/caros/otaclient/',
    '/home/caros/secure_upgrade/python/',
    '/usr/local/python3/lib/python38.zip',
    '/usr/local/python3/lib/python3.8',
    '/usr/local/python3/lib/lib-dynload',
  ]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

Current thread 0x00007fdb42ed8740 (most recent call first):
<no Python frame>

首先卸载原来的pip3
sudo apt remove python3-pip
然后在安装一下
sudo apt install python3-pip

重新安装一下pip就可以了啊,你原来的pip就直接是pip，升级后的是pip3，出现了多版本，系统不知道你要使用哪个

，

然后发现是Python3升级后的环境依赖还是以前的，怎么解决这个问题呢