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The following error message may appear on your terminal hinting the unavailability of the curl command:

Command 'curl' not found, but can be installed with:
OR
bash: /usr/bin/curl: No such file or directory

1. To resolve this issue first try to install the curl command. First and the most obvious installation method is to execute the following command:

   $ sudo apt install curl
   

2. In case the curl command is still not found check whether the curl binary executable exists:

   $ ls  /usr/bin/curl
   /usr/bin/curl
   

   Check if you can execute the command using a full path:

   $ /usr/bin/curl --version
   curl 7.66.0 (x86_64-pc-linux-gnu) libcurl/7.66.0 OpenSSL/1.1.1d zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.20.2 (+libidn2/2.0.5) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3
   

3. Next, ensure the path to the curl is a part of your executable shell path:

   $ echo $PATH
   /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
   

4. Lastly, you may try to reinstall the curl command:

   $ sudo dpkg-reconfigure curl