Colab Problem import repositories (new -- started today)

[davetew]

A new problem developed today when importing a repository in a Colab notebook that I have used many times over the past ~month.

When attempting to import the repository using !apt-add-repository -y ppa:speth/cantera, I get an error message stating that there is an issue related to gi--a python module that seems to be employed by apt-add-repository.

ImportError: cannot import name '_gi' from 'gi' (/usr/lib/python3/dist-packages/gi/__init__.py)

A link to a workbook that contains an example of the problem is below.

Example Notebook

Thank you for any help that you might be able to offer.

Regards,
Dave
PS: The problem occurs in both Safari & Chrome.

[craigcitro]

Thanks for the report -- this was related to the python 3.7 update, and we're working on rolling out a fix already. It should land shortly, but I'll update this issue when it does.

[craigcitro]

Also, as a short-term workaround until the fix is live, you can do

!python3.6 /usr/bin/add-apt-repository ...

and it'll work just as before.

[drew-parsons]

The most appropriate and simplest fix is to upgrade the Colab host environment from Ubuntu bionic 18.04 to Ubuntu groovy 20.04.

[craigcitro]

This should be fixed -- if you either reconnect or (if you've got a session running) Factory reset runtime, you should once again have a working add-apt-repository.

[davetew]

Thank you very much. The fix did seem to resolve the issue with add-apt-repository. However, when I try to import the module that is installed from the repository, it fails with a somewhat similar error.

(ModuleNotFoundError: No module named 'cantera._cantera')

_cantera.pxd does indeed seem to be where is should be in /usr/lib/python3/dist-packages/cantera; however, the import fails. This import also worked yesterday (2/23).

A link to an updated workbook with the additional import statement is below
Cantera Notebook

Thanks again for any additional help that you might be able to offer!

Regards,
Dave

[craigcitro]

It looks like the ubuntu installation you're following only works with 3.6, unfortunately.

I don't know anything about cantera; I'd try asking upstream.

[francesco-ballarin]

The most appropriate and simplest fix is to upgrade the Colab host environment from Ubuntu bionic 18.04 to Ubuntu groovy 20.04.

@drew-parsons @craigcitro I agree with that. Are there any plans to upgrade to 20.04?

[colaboratory-team]

#1880 tracks the 20.04 update.

[davetew]

Thank you very much for the very quick responses! Regards, Dave On Feb 24, 2021, at 2:05 PM, Craig Citro ***@***.******@***.***>> wrote: Also, as a short-term workaround until the fix is live, you can do !python3.6 /usr/bin/add-apt-repository ... and it'll work just as before. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#1875 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AEHJ44Y2L55HLSUHF5CAJXTTAVEYRANCNFSM4YFCKF3Q>.