[에러 슈팅] conda 파이썬 버전 변경시 (conda install python=3.6.6)

conda install python=3.6.6 버전 설치 시

다음과 같은 에러가 발견되었을 시

active environment : None
       user config file : /home/nicholasc/.condarc
 populated config files : 
          conda version : 4.4.7
    conda-build version : not installed
         python version : 2.7.14.final.0
       base environment : /home/nicholasc/anaconda2  (read only)
           channel URLs : https://repo.continuum.io/pkgs/main/linux-64
                          https://repo.continuum.io/pkgs/main/noarch
                          https://repo.continuum.io/pkgs/free/linux-64
                          https://repo.continuum.io/pkgs/free/noarch
                          https://repo.continuum.io/pkgs/r/linux-64
                          https://repo.continuum.io/pkgs/r/noarch
                          https://repo.continuum.io/pkgs/pro/linux-64
                          https://repo.continuum.io/pkgs/pro/noarch
          package cache : /home/nicholasc/anaconda2/pkgs
                          /home/nicholasc/.conda/pkgs
       envs directories : /home/nicholasc/anaconda2/envs
                          /home/nicholasc/.conda/envs
               platform : linux-64
             user-agent : conda/4.4.7 requests/2.18.4 CPython/2.7.14 Linux/4.10.0-38-generic ubuntu/16.04 glibc/2.23
                UID:GID : 1095:1000
             netrc file : None 
           offline mode : False



Proceed ([y]/n)? y

Preparing transaction: failed

SafetyError: The package for certifi located at /home/nicholasc/anaconda2/pkgs/certifi-2017.11.5-py36hf29ccca_0
appears to be corrupted. The path 'lib/python3.6/site-packages/certifi/__pycache__/__main__.cpython-36.pyc'
has a sha256 mismatch.
  reported sha256: c9a6c77ce469f80cf327424500e96d3808c708a75a45f40d89aa25a6b9a4e03c
  actual sha256: 7a2a59764be4ce9febc2e46d1192bef777539f8cfaf60c09649df414fdee3aed

버전 설치 시 base environment가 "read only"가 되어서 그렇다.

sudo chown -R username /home/username/miniconda