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折騰了好久了都， Let ’ s Encrypt 證書續(xù)期總是出現(xiàn)這個(gè) virtualenv 的問題,我的VPS用的是Debian，求大蝦幫忙看看是哪里出問題了？ 具體提示如下：

……
libffi-dev is already the newest version.
python is already the newest version.
python-dev is already the newest version.
python-virtualenv is already the newest version.
virtualenv is already the newest version.
libssl-dev is already the newest version.
openssl is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Creating virtual environment...
Traceback (most recent call last):
  File "/usr/local/bin/virtualenv", line 7, in <module>
    from virtualenv import main
ImportError: No module named virtualenv

到這里就停止了，造成 Let ’ s Encrypt 證書續(xù)期無法完成，求解？