After updating Anaconda-Navigator environments dont work
I think this is a bug. My experiance is that when you upgrade to Navigator to 1.9.12.
the enviroment variables in GUI(Navigator UI), are taken from base enviroment not from second enviroment and if you work from console it work, so it looks like it not executes conda activate new_environment in gui. When you work from terminal everythings works fine.
To be honest it has the same behaviour if fresh install last anaconda too. This was the reason i have downgraded conda isntallation, and than i found out that last version of navigator was making the issues . Or you can downgrade:
conda install anaconda-navigator=1.9.7.
I updated Anaconda-Navigator to 1.9.12 on ubuntu and now my environments dont work. 
I can still start a jupyter notebook from the environment but all my installed packages are not available even though they are displayed in the anaconda-navigator gui under installed packages for this env. 
but when I import a package in a notebook : ModuleNotFoundError: No module named ....
The standard packages like numpy are available though...
Please help me... why did I update!!!!????
maybe a path problem? Please help me in simple terms 
Thanks