%pip install backports.lzma || py7zr can’t be installed

When trying to install, starts but it says “Failed to build backports.lzma” and other case “Preparing metadata (pyproject.toml): finished with status 'error'”. After the error kernel starts to works odd, every time when re starting the kernel died and then starts again.

Reproduce the `%pip install backports.lzma` and `py7zr` installation failures in Carnets, then observe the kernel restart behavior described in the report. Start by identifying where package installation and kernel lifecycle errors are surfaced; done means the package installation completes without the reported metadata or build errors and the kernel remains stable after restarting.

Written by the indexing model from the issue text.