anaconda4.4版本以上，命令conda activate报错

背景

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。