Using Ubuntu 16.04
Tried to set python 3.6 as default for the
python3 command. I found what seemed to be the answer and quickly copy-pasted the following lines without carefully reading:
$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 1 update-alternatives: using /usr/bin/python3.6 to provide /usr/bin/python (python) in auto mode $ sudo update-alternatives --set python /usr/bin/python3.6
This is the result:
$ python3 Python 3.5.2 (default, Nov 12 2018, 13:43:14) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. $ python Python 3.6.8 (default, Dec 24 2018, 19:24:27) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information.python
A friend of mine tried to set it back like this:
$ sudo update-alternatives --install /usr/bin/python3.6 python /usr/bin/python 1 update-alternatives: renaming python link from /usr/bin/python to /usr/bin/python3.6
And this was the result:
$ python zsh: command not found: python
And now anything linked with python 3.6 gets the error "Too many levels of symbolic links", like in this example:
$ sudo update-alternatives --config python update-alternatives: warning: alternative /usr/bin/python (part of link group python) doesn't exist; removing from list of alternatives update-alternatives: error: cannot stat file '/usr/bin/python3.6': Too many levels of symbolic links
The BIG problem is that if you close the terminal like like my friend did then the terminal app stops working all together. He now has to reinstall Ubuntu. And I am in the same situation, just that I still DID NOT CLOSE my terminal and (for now) everything works fine.
How can I reverse the symbolic links?