Raspberry Pi 2, Jan 2015 Raspbian image. Launching Mathematica results in a 'Wolfram Product Activation' dialog and I'm asked for an Activation Key. What do I enter at this point so that I can click 'Activate'?
To add a user that can run the Wolfram Language:
pi@test-pi ~ $ sudo adduser pi2
Adding user pi2' ...
Adding new grouppi2' (1004) ...
Adding new user pi2' (1001) with grouppi2' ...
Creating home directory /home/pi2' ...
Copying files from/etc/skel' ...
Adding new group
pi2' (1001) with group
Copying files from
Add it to the 'video' group (required as part of a number of checks that the Wolfram Language is running on a Raspberry Pi):
pi@test-pi ~ $ sudo usermod -a -G video pi2
Switch to 'pi2' account, and run the wolfram engine:
pi@test-pi ~ $ su - pi2
pi2@test-pi ~ $ wolfram
Wolfram Language (Raspberry Pi Pilot Release)
Copyright 1988-2015 Wolfram Research
Information & help: wolfram.com/raspi
What user are you running Mathematica as? Is that user a member of the 'video' group?
sudo usermod -a -G video myuser
should do the trick.
Aha! It works for 'root'. Permissions problem somewhere, then. Investigation continues...
Mathematica needs appropriate permissions to talk to the GPU hardware, and the 'video' group can access the corresponding device in /dev.
OK, so, if Mathematica can't access /dev/fb0 and/or /dev/vchiq, it reports this as a problem with licence activation. Forgive me if I seem crashingly naive, but this makes no sense at all!
I agree it is a counterintuitive way to fail. The appropriate developers have been made aware of this issue.
I'm having the same problem.
I've tried uninstall and reinstall, unsuccessfully. I found file '/opt/Wolfram/WolframEngine/10.0/Configuration/Licensing/mathpass' which contains what looks like an activation key, and entered that, but it appears to have expired. How is anyone using Mathematica on Raspberry Pi if no licensing and activation information is available?
The user wasn't a member of the 'video' group, but it is now, and now Mathematica works. Thanks! So... What was going on there, then? There appears to be nothing on the entire RPi filesystem with that GID, as far as I can tell.
yup, adding the user to the video group did the trick for me as well. Thanks!
Mathematica on 2nd Pi2 fixed the same way. We can but hope there are enough good keywords in this thread to bring other sufferers to this solution. I'd still quite like to know why, though.
Thanks again, Ilian!
Ha! Excellent. Thanks.
I am new to Linux and Raspberry Pi (and need to stop saying that).
This worked for me. Just following the insructions worked.
Thank you Arnoud.
It is just a matter of finding the right expert at the right time.
The problem still exists as of 12.1.1:
➜ ~ wolfram
Mathematica 12.1.1 Kernel for Linux ARM (32-bit)
Copyright 1988-2020 Wolfram Research, Inc.
Mathematica 12.1.1 Kernel cannot find a valid password.
For automatic Web Activation enter your activation key
(enter return to skip Web Activation):
You will need to get a password from your
license certificate or from Wolfram Research
Machine name: raspi2
You will need a valid activation key and password in order
to proceed. Go to http://user.wolfram.com to
register your activation key and obtain the password.
Enter your Activation key [format xxxx-xxxx-xxxxxx]:
Enter your password:
The password you entered is not valid.
Please press Enter to quit.
Adding the user to the video group fixed it for me. I figure adding full command output as above may help others (like a future me, once I've forgotten this) find this thread.
Edited to add: To fix the problem for the current user (regardless of that user's name), you can use:
sudo usermod -a -G video $(whoami)
Great, so I'm not completely alone....
I have the same symptoms: Mathematica/wolfram work for root user, but not for anyone else.
Unfortunately the adding to the video group doesn't help, but also, I'm running Kali, rather than Raspian
Any ideas on how to debug this? Potentially this would require entries to the policy kit database somewhere below /etc/polkit-1/localauthority/... ???
OK, to solve my own question: turns out only /dev/fb0 is (under Kali) owned by root:video while /dev/vchiq is owned root:root.
Further, /dev/vchiq is NOT group read/writable.
Changing ownership from root:root to root:video and adding rw permissions for group to /dev/vchiq "solves" the issue, i.e. it allows Mathematica to work.
While that's good, there are two things that are NOT good:
a) the failure mode is absolutely horrid.
b) what are the security implications of allowing regular users read write access to low level hardware?
To make such permissions a requirement for Mathematica is, shall we say it politely, questionable.