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Unable to start Jupyter notebook on VS Code

(Using latest miniconda + VS Code on 64-bit Windows10:) After clean reinstalling VS Code, I can no longer launch jupyter notebook from within it. When I tried to create a new jupyter file for the first time, the Python extension installed ipykernel in my virtual environment "da38" (my main working environment). Then it stays on Connecting to IPython kernel: Connecting to kernel for an unusually long time, and stops with the error message Unable to start session for kernel Python 3.8.5 64-bit ('da38':conda) (images pasted below). I also removed and re-created da38 environment just in case. Used jupyter many times before with no issues until this new VS Code install today, and an identical setup is working on my other computer. Any help is appreciated. Thanks!

I had the latest version and below command worked for me
python -m pip install 'traitlets==4.3.3' --force-reinstall

This issue also occurs on my computer. The solution is to restore the version number of a dependency package "traitlets" of ipython kernel to 4.3.3.
You could try to use "conda list" to view the version of the module traitlets in the current conda environment. If it shows version 5.0, it is recommended that you use version 4.3.3.
Reference: Unable to start session for kernel Python.

I had this same problem. What worked for me is updating ipykernel.
$ pip install ipykernel --upgrade
I also did a few other upgrades just in case.
$ pip install traitlets --upgrade
$ pip install notebook --upgrade
I did not role back to an older version like 'traitlets==4.3.3'.

If anyone facing same issues now, Can check below steps which helped me to solve this
Update and Restart VS code
Install latest Jupyter Extension from Extensions.

We need to update "ipykernel" and restart VSC:
pip install ipykernel --upgrade

Jupyter command `jupyter-lab` not found

I have tried to install jupyter lab on my Kubuntu machine.
If I install jupyter lab with 'pip3 install jupyter jupyterlab' the command 'jupyter notebook' works completly fine. But if I try to run 'jupyter lab' every time I get the message:
Traceback (most recent call last):
File "/usr/local/bin/jupyter", line 11, in <module>
sys.exit(main())
File "/usr/local/lib/python3.6/dist-packages/jupyter_core/command.py", line 230, in main
command = _jupyter_abspath(subcommand)
File "/usr/local/lib/python3.6/dist-packages/jupyter_core/command.py", line 133, in _jupyter_abspath
'Jupyter command `{}` not found.'.format(jupyter_subcommand)
Exception: Jupyter command `jupyter-lab` not found.
What is wrong?
I tried to reinstall jupyter and jupyterlab multiple times with the same issue.

Its the space. Its always the space. Never ever use spaces within package name. Its always either namepart1-namepart2 or namepart1namepart2. This is because arguments are separated by space. So if you put space in between, it makes pip think that you want to install two different packages named jupyter and lab. Just use:
python -m pip install jupyterlab
Or simply:
pip install jupyterlab
No need to uninstall or reinstall anything. However to run jupyter lab server you might want to add spaces as follows:
jupyter lab

In my case, the only way to fix this was to add the following directory to the PATH in Linux:
/home/ubuntu/.local/bin

When installing jupyterlab, we may get warning like this:
Installing collected packages: jupyterlab
WARNING: The scripts jlpm, jupyter-lab, jupyter-labextension and jupyter-labhub are installed in '/home/tln/.local/bin' which is not on PATH.
Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed jupyterlab-3.0.14
So as per this warning, scripts like jupyter-lab will be unavailable unless added to the PATH.
Use below command to add these scripts to be able to use from command line:
tln#tln-X550LD:~$ export PATH="$HOME/.local/bin:$PATH"
That's it. This worked fine for me.

I had the same error on Windows 10. It was with pip install jupyterlab. Then after the error I uninstalled it with pip and reinstalled with "pip install jupyterlab". Everything worked flawlessly thereafter.
In your case you're using pip3. Try it as above or see if pip3 needs an update.

I had same issue. I solved it running pip install jupyterlab in prompt with admin privilegies.

Had the same issue and resolved it by installing with pip3
pip3 install jupyterlab;
jupyter lab

If you face -bash: jupyter-lab: command not found or -bash: jupyter: command not found, etc., you can look for "jupyter-lab" and enter that full path instead.
Mac:
$ /Users/mark/venv/bin/jupyter-lab
Windows:
C:\mark\venv\Scripts\jupyter-lab.exe

I got this same error every time I forgot to activate the virtualenv jupyterlab was installed into. After activating the virtualenv, all's well.
With pip
$ source [path_to_venv]/bin/activate
With pipenv
$ pipenv shell
Then, with a prompt indicating an activated shell, you can enter your command
(venv) $ jupyter lab
With conda or other more holistic python environments, you probably use their gui to activate a virtualenv with jupyter and jupyterlab installed.

Install with Anaconda
conda install -c conda-forge notebook
conda install -c conda-forge jupyter
conda install -c conda-forge jupyter_contrib_nbextensions

Once installed you just have to run
pip install jupyterlab
~/.local/bin/jupyter-lab
and ready and open browser http://localhost:8888/lab
Ubuntu 22
Lubuntu 22

well the problem is like this:
the jupyterlab module has not been packaged for debian, but the jupyterlab_server package has, named python3-jupyterlab-server.
please sudo apt install python3-jupyterlab-server.
then, as your user, run pip3 install jupyterlab, that will install it in your ~/.local/bin a few programs, the missing jupyter-lab among them.
last, but not least, run jupyter-serverextension enable --py jupyterlab.
to be able to run jupyter lab, you first need to run export PATH="/home/$(whoami)/.local/bin:"$PATH. this command will run automatically if added to your ~/.bash_profile.

ubuntu can not find the jupyter-lab because it is not in path.
in order to check the place of installment. run below command
find ~ -name jupyter-lab
possible result: /home/soshiant/.local/bin/jupyter-lab
for adding a directory to the Linux path you can follow below link:
How to add a directory to the PATH

if anyone still struggling ...
try:
find ~ -name jupyter-lab
and then:
export PATH=[path]
then try again: jupyter lab
note:
don't add any extra spaces and PATH is case sensitive and if u still struggling just try to install any missing pkgs after hosting to the main path by opining another tab or changing the path to main.
and then host to localhost:8888/lab
that should works fine...

I was using conda to install
conda install -c conda-forge jupyterlab
and this error came about.
I simply used this command to get it to run.
pip install jupyterlab

In my ubuntu installation this was qused by not using sudo before the install.
sudo pip install jupyterlab
If you already installed jupyterlab, and it dit not work, you can install again using sudo, you dont need to remove the old version first for it to work

pip configuration go wrong after ubuntu restart

after restart my ubuntu 16.04, could not find pip
I can only get my original pip via python3 -m pip freeze
if I use pip freeze there shows bash: /usr/bin/pip: No such file or directory
And I installed my jupyter via pip install and I could not use jupyter notebook command now. It shows jupyter: command not found
And I make sure I use sudo apt-get update and when I want to install a new jupyter with sudo apt-get install jupyter-notebook it shows
E: Unable to locate package jupyter-notebook
Seems several system configuration go wrong? How to recover these? How can I open my jupyter?

bash: /usr/bin/pip: No such file or directory
Verify the file /usr/bin/pip exists. If it does check the first line:
head -1 /usr/bin/pip
The line (called shebang) must be something like #!/usr/bin/python. If it isn't edit the file and fix the shebang line to point to an existing python binary.
I installed my jupyter via pip install and I could not use jupyter notebook command now. It shows jupyter: command not found
It's because pip installed jupyter into a directory not in $PATH. Most probably /usr/local/bin/. Check the directory with pip show --files jupyter and add the directory to your $PATH both in the current shell and in your ~/.bash_profile.
I want to install a new jupyter with sudo apt-get install jupyter-notebook it shows E: Unable to locate package jupyter-notebook
Try sudo apt-get update.

The pip problem has been solved.
The reason is that PATH is somehow modified and it loses the ~/.local/bin, the original pip is in this path and pip also install jupyter notebook in this path.
After I added ~/.local/bin to PATH I can run pip and jupyter notebook, in brief this is a path problem

Open spyder in ubuntu

I want to open spyder(Python IDE) in ubuntu.
Normally I would write "spyder" in the shell, and it would open the spyder IDE.
Now when I write spyder in the shell, it just new lines, and nothing happens(similar to pressing 'enter').
--- How do I get my spyder back?
EDIT - I get no errors, it just skips to the next line.

If typing "spyder" doesn't work, you might want to try typing "spyder3" in case you installed the spyder3 version. Below is what worked for me in my Ubuntu system.
To install spyder via pip (my python version is 3.6.2), I used:
pip install spyder
Then, I had to install another package:
pip install PyQtWebEngine
Finally, to open the Spyder window, I typed into my terminal:
spyder3

You may simply have to update spyder.
If you are NOT using anaconda:
pip install --update spyder
Or, if you are in anaconda:
conda update spyder
I had the same issue as yours, with also a message in the command line saying:
Spyder is already running. If you want to open a new
instance, please pass to it the --new-instance option
The above update allowed me to open spyder from the command line.

I had this problem as well, and found this post on it in an askubuntu forum. It suggested using sudo apt-get purge spyder to delete any faulty configuration files and then reinstall with sudo apt-get install spyder. I found it worked, and spyder reopened with my previous files on the text editor.

in Ubuntu, just go to your,
cd home/<your account>
then go to .spyder2 folder
cd spyder2
should get you there
in terminal, type la in terminal(ls doesn't show the hidden files ) and use,
rm -f spyder.lock
to delete

A simple way to install spyder is:
sudo apt install spyder

now uninstall spyder and do this :
#first install spyder
sudo apt install spyder
#updata your conda
conda update anaconda
#updata spyder
conda update spyder
#then write this and wait
spyder
use this link
or if you do not have conda use thislinl=k

To launch spyder in bash console, just enter:
spyder .
in the bash console.

How to make Jupyter Notebook to point to the same Python installation as Terminal on Ubuntu?

I am on a Ubuntu machine. I installed Jupyter Notebook using the following command.
sudo snap install jupyter
But Jupyter cannot find any of the installed python packages which were installed using terminal. I checked if jupyter and terminal are pointing to same python installation using this code.
import sys; print(sys.executable)
Terminal shows this output.
'/usr/bin/python3'
And Jupyter shows this one.
'/snap/jupyter/6/bin/python'
Now I want the jupyter to point the same installation path as the terminal shows. How can I do that?

your jupyter is not placed in default packages location due to installing it with snap. install jupyter with pip this way: pip install jupyter
if you dont have pip then download it. it usually is included in python package