Wups ! I forgot that I *did* create Trac#21816 
<https://trac.sagemath.org/ticket/21816> for that... 

Le mercredi 29 novembre 2017 21:00:17 UTC+1, Emmanuel Charpentier a écrit :
>
> ISTR to have reported (no ticket, just n sage-devel or sage-release) that, 
> after installing the Sage kernel in the system's jupyter notebook, the Sage 
> kernel failed to start due to lack of definitopn for SAGE_ROOT. Trace of 
> execution :
>
>
> ===================================================================================
> charpent@asus16-ec:~$ jupyter notebook
> [I 20:43:16.366 NotebookApp] Serving notebooks from local directory: 
> /home/charpent
> [I 20:43:16.366 NotebookApp] 0 active kernels
> [I 20:43:16.366 NotebookApp] The Jupyter Notebook is running at:
> [I 20:43:16.366 NotebookApp] 
> http://localhost:8888/?token=0eed5f7eb89f576804250b9a5351fdb923874706db8e325a
> [I 20:43:16.366 NotebookApp] Use Control-C to stop this server and shut 
> down all kernels (twice to skip confirmation).
> [C 20:43:16.368 NotebookApp] 
>     
>     Copy/paste this URL into your browser when you connect for the first 
> time,
>     to login with a token:
>         
> http://localhost:8888/?token=0eed5f7eb89f576804250b9a5351fdb923874706db8e325a
> [10704:10744:1129/204316.598038:ERROR:nss_util.cc(725)] After loading Root 
> Certs, loaded==false: NSS error code: -8018
> ATTENTION: default value of option force_s3tc_enable overridden by 
> environment.
> [I 20:43:17.210 NotebookApp] Accepting one-time-token-authenticated 
> connection from ::1
>
> ------------------------------------------------------------------------------------------------------------------------
> Here I attempt to open a pre-existing Sage notebook (generated with Sage's 
> jupyter
>
> ------------------------------------------------------------------------------------------------------------------------
> [W 20:43:18.336 NotebookApp] 404 GET 
> /static/components/moment/locale/fr.js?v=20171129204313 (::1) 6.58ms 
> referer=http://localhost:8888/tree
> [W 20:43:37.427 NotebookApp] 404 GET 
> /static/components/moment/locale/fr.js?v=20171129204313 (::1) 1.67ms 
> referer=http://localhost:8888/notebooks/Untitled.ipynb
> Error: You must set the SAGE_ROOT environment variable or run this
> script from the SAGE_ROOT or SAGE_ROOT/local/bin/ directory.
> Error setting environment variables by sourcing 
> '/usr/local/sage-8/local/bin/sage-env';
> possibly contact sage-devel (see http://groups.google.com/group/sage-devel
> ).
> [I 20:43:37.512 NotebookApp] Kernel started: 
> 0328ab43-a940-40a7-9371-c53f72f0b853
> [I 20:43:40.510 NotebookApp] KernelRestarter: restarting kernel (1/5)
> Error: You must set the SAGE_ROOT environment variable or run this
> script from the SAGE_ROOT or SAGE_ROOT/local/bin/ directory.
> Error setting environment variables by sourcing 
> '/usr/local/sage-8/local/bin/sage-env';
> possibly contact sage-devel (see http://groups.google.com/group/sage-devel
> ).
> [I 20:43:43.517 NotebookApp] KernelRestarter: restarting kernel (2/5)
> Error: You must set the SAGE_ROOT environment variable or run this
> script from the SAGE_ROOT or SAGE_ROOT/local/bin/ directory.
> Error setting environment variables by sourcing 
> '/usr/local/sage-8/local/bin/sage-env';
> possibly contact sage-devel (see http://groups.google.com/group/sage-devel
> ).
> [I 20:43:46.523 NotebookApp] KernelRestarter: restarting kernel (3/5)
> Error: You must set the SAGE_ROOT environment variable or run this
> script from the SAGE_ROOT or SAGE_ROOT/local/bin/ directory.
> Error setting environment variables by sourcing 
> '/usr/local/sage-8/local/bin/sage-env';
> possibly contact sage-devel (see http://groups.google.com/group/sage-devel
> ).
> [W 20:43:47.639 NotebookApp] Timeout waiting for kernel_info reply from 
> 0328ab43-a940-40a7-9371-c53f72f0b853
> [I 20:43:49.529 NotebookApp] KernelRestarter: restarting kernel (4/5)
> WARNING:root:kernel 0328ab43-a940-40a7-9371-c53f72f0b853 restarted
> Error: You must set the SAGE_ROOT environment variable or run this
> script from the SAGE_ROOT or SAGE_ROOT/local/bin/ directory.
> Error setting environment variables by sourcing 
> '/usr/local/sage-8/local/bin/sage-env';
> possibly contact sage-devel (see http://groups.google.com/group/sage-devel
> ).
> [W 20:43:52.535 NotebookApp] KernelRestarter: restart failed
> [W 20:43:52.535 NotebookApp] Kernel 0328ab43-a940-40a7-9371-c53f72f0b853 
> died, removing from map.
> ERROR:root:kernel 0328ab43-a940-40a7-9371-c53f72f0b853 restarted failed!
> [W 20:43:52.550 NotebookApp] 410 DELETE 
> /api/sessions/478a47ac-4621-4f7d-975e-0aad30ec3dbc (::1): Kernel deleted 
> before session
> [W 20:43:52.550 NotebookApp] Kernel deleted before session
> [W 20:43:52.550 NotebookApp] 410 DELETE 
> /api/sessions/478a47ac-4621-4f7d-975e-0aad30ec3dbc (::1) 1.49ms referer=
> http://localhost:8888/notebooks/Untitled.ipynb
> ------------------------------------
> Here, I throw the towel...
> ------------------------------------
> [W 20:43:59.019 NotebookApp] 404 DELETE 
> /api/sessions/478a47ac-4621-4f7d-975e-0aad30ec3dbc (::1): Session not 
> found: session_id='478a47ac-4621-4f7d-975e-0aad30ec3dbc'
> [W 20:43:59.020 NotebookApp] Session not found: 
> session_id='478a47ac-4621-4f7d-975e-0aad30ec3dbc'
> [W 20:43:59.020 NotebookApp] 404 DELETE 
> /api/sessions/478a47ac-4621-4f7d-975e-0aad30ec3dbc (::1) 2.46ms referer=
> http://localhost:8888/notebooks/Untitled.ipynb
>
> ===================================================================================
>
> Defining SAGE_ROOT before starting jupyter fixes the problem.
>
> Trying to start  Sage's R kernel (installed in Sage's R) gives similar 
> results.
>
> Ticket-worthy ?
>
> --
> Emmanuel Charpentier
>
> Le mercredi 29 novembre 2017 17:33:02 UTC+1, Jeroen Demeyer a écrit :
>>
>> On 2017-11-29 15:55, tuxedomask2002 wrote: 
>> > The executable, following the documentation. 
>>
>> Sorry, I cannot help you further given the explanation that you gave. 
>> There is obviously something wrong with your setup, but I cannot guess 
>> what. 
>>
>> In any case, you should not manually set SAGE_ROOT if you just want to 
>> run Sage. 
>>
>> Also note that your report is a bit inconsistent. In your first post, 
>> you talked about running "sage" and later you talked about running 
>> "./sage" The difference is important! 
>>
>

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