Last login: Fri Sep 9 22:07:43 on ttys000

young@yeong-iui-MacBookAir ~ % sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10

Password:

sudo: update-alternatives: command not found

young@yeong-iui-MacBookAir ~ % sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10

sudo: update-alternatives: command not found

young@yeong-iui-MacBookAir ~ % sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10

sudo: update-alternatives: command not found

young@yeong-iui-MacBookAir ~ % 

라고 뜨는데 어떻게 해결해야 할까요 ㅠㅠ,, ubuntu가 잘 연결이 된건지도 모르겠어요..

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@     WARNING: UNPROTECTED PRIVATE KEY FILE!     @

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Permissions 0644 for '/Users/young/Desktop/sparta_mykey.pem' are too open.

It is required that your private key files are NOT accessible by others.

This private key will be ignored.

Load key "/Users/young/Desktop/sparta_mykey.pem": bad permissions

ubuntu@3.36.99.223: Permission denied (publickey).

이런 문구가 떴었거든요,,