Its partial fault on all sides that added up.

Ubuntu shipped with that issue for some time and fixed it after some time.

Pop os iso on the download page contained it.

The package came from ubuntu but this issue was not visible since up to date pop os does not have this issue. Only the version in iso. So Pop os too made some mistake.

Linus tried to install steam. The installer does not allow removing necessary packages. He tried to install anyway ignoring all warnings, in cli.

It says if you are so sure, type “Yes, Do as I say!” with all cases and punctuation correct. Why would you be required to type a very specific phrase to install steam? Its a clear warning for confirmation. He too makes mistake by ignoring all warnings.

Not to blame anyone but all of them did partial mistake that added up