在我的Ubuntu 20.04.我使用两个python版本。其中一个是Python3.8.2，它随我的Ubuntu安装而来，另一个是Python3.7.5。我在系统默认版本旁边安装了Python3.7.5，使用update-替代品。但是现在的问题是没有pip命令在Python3.7.5上工作。虽然pip在这个（Python3.7.5）安装中可用，但是在打印版本时，它显示了以下内容（使用命令pip 3.7-V）：

pip 19.2.3 from /usr/local/lib/python3.7/site-packages/pip (python 3.7)

但是每当我尝试使用安装包时，它总是显示标题中提到的错误。例如，在安装以下软件包时：

sudo pip3.7 install intel-tensorflow==1.15.2

将引发以下错误：

WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting intel-tensorflow==1.15.2
  WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/intel-tensorflow/
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/intel-tensorflow/
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/intel-tensorflow/
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/intel-tensorflow/
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/intel-tensorflow/
  Could not fetch URL https://pypi.org/simple/intel-tensorflow/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/intel-tensorflow/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping
  ERROR: Could not find a version that satisfies the requirement intel-tensorflow==1.15.2 (from versions: none)
ERROR: No matching distribution found for intel-tensorflow==1.15.2
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping

为什么会发生这种情况？它再次显示所有pip3的相同错误。7安装，无论我要安装哪个模块。而且，每当我使用系统默认的python版本（Python3.8.2）时，也不会出现类似的问题。