Update install dependency for Ubuntu 22.04 for 'Desktop support for Flutter': Linux "additional requirements" section

[maks]

Page URL

https://docs.flutter.dev/development/platform-integration/desktop#additional-linux-requirements

Page source

https://github.com/flutter/website/tree/main/src/development/platform-integration/desktop.md#additional-linux-requirements

Describe the problem

Currently the section has this text:

Run the following command

sudo apt-get install clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev

This is now missing libstdc++-12-dev as was covered in flutter/flutter#115909 (comment)

I tested this on Ubuntu 22.04.1 which the current LTS release and got the same error is in this comment when trying to run a app created with flutter create test_linux installing libstdc++-12-dev with apt, running flutter clean again and then running allowed the counter app to run as expected.

Expected fix

Change line to read:

sudo apt-get install clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev libstdc++-12-dev

Additional context

No response

[parlough]

@cbracken Wasn't sure who to reach out to, but do you know if adding libstdc++-12-dev to the list of packages for Linux desktop support is the correct solution here? Is there a good way we can stay up to date with the requirements?

[maks]

@parlough as I understood it, the added dependency on the libstdc++-12-dev came about because that version of the c++ std lib package was no longer an implicit transient dependency of one of the other listed dependencies. I suspect this wouldn't happen very often in the future but I guess the best way to spot this in the future would be CI machines failing because they don't have the required dependency?

[parlough]

Thanks for the extra context @maks, makes sense!

[kriswuollett]

Just encountered this as well. At least regarding addressing the issue in the website docs, I'd like to suggest adding a tabbed example code box that can accommodate a few of the most widely used Linux distributions to show the command line(s) to make sure the packages are installed, e.g., the tabbed-format used in Google Cloud docs which has a cool dropdown for tabs overflow.

[fertrig]

This change went in on early April. However, I don't see the change on the live website yet.

How often are the website changes published?