Help:Installation/Troubleshooting/Your requirements could not be resolved to an installable set of packages

Issue
Composer issues "Your requirements could not be resolved to an installable set of packages." followed by "Installation failed, reverting ./composer.json to its original content."CiteRef::mail:user:smw:36080889

This issue appears for MediaWiki 1.29 and later when installing the respective point release from tarballs and issuing the following command:

Solution
The issue can be mitigated by running the following two commands: