There is an instance of anaconda navigator already running error

one of the following will solve your issue in ubuntu:

killall Anaconda-Navigator 

anaconda-navigator --reset

1.In anaconda prompt

 $ anaconda-navigator --reset
 $ anaconda-navigator

I met the same problem a few days ago. I found the anaconda navigator will start a process called pythonw. So the following is my solution:

  1. open a cmd window;
  2. use command tasklist | findstr "pythonw" to find the pid of pythonw, like 37200;
  3. use command tskill 37200 to kill the process.

By the way, my OS is Windows.


I got the same error in MAC. logoff & login did not resolve the issue and the below command solved my issue in mac. Restart not required.

killall python