This is no new issue and most likely it will only be relevant to older rails projects, but since I faced the same issue again and meanwhile forgot what it was about and how it should be fixed, here a note to self.
For more details and an appropriate header image for this subject, check out Christine's Post on this issue: What's up with mimemagic breaking everything?
While running bundle install
Gem::Ext::BuildError: ERROR: Failed to build gem native extension. current directory: /bundle/gems/mimemagic-0.4.3/ext/mimemagic ... Could not find MIME type database in the following locations: ... Ensure you have either installed the shared-mime-info package for your distribution, or obtain a version of freedesktop.org.xml and set FREEDESKTOP_MIME_TYPES_PATH to the location of that file.
The answer is already in the error message, you need to install
shared-mime-info which I did add to the