使用系统为Ubuntu 18.04.5 LTS
有次更换shell为zsh后，想要激活某个conda环境，输入命令后，报错如下：
CommandNotFoundError: Your shell has not been properly configured to use 'conda deactivate'.
If your shell is Bash or a Bourne variant, enable conda for the current user with
$ echo ". /opt/anaconda3/etc/profile.d/conda.sh" >> ~/.bashrc
or, for all users, enable conda with
$ sudo ln -s /opt/anaconda3/etc/profile.d/conda.sh /etc/profile.d/conda.sh
The options above will permanently enable the 'conda' command, but they do NOT
put conda's base (root) environment on PATH. To do so, run
$ conda activate
in your terminal, or to put the base environment on PATH permanently, run
$ echo "conda activate" >> ~/.bashrc
Previous to conda 4.4, the recommended way to activate conda was to modify PATH in
your ~/.bashrc file. You should manually remove the line that looks like
export PATH="/opt/anaconda3/bin:$PATH"
^^^ The above line should NO LonGER be in your ~/.bashrc file! ^^^
解决方法
查看了conda4.4版本后的changelog以及一些解答，发现可以在激活前通过命令source activate转换到conda的base环境，在输入平时想要进入其他环境要输入的命令，如conda activate self-environment。
为了不用每次都要输入该命令，可以直接将source activate写入.zshrc（根据自身情况而定）文件里，这样每次打开shell后会自动激活conda。
