Install ruby-mimemagic by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-mimemagic
Description:
fast MIME detection by extension or content
The mimemagic Ruby library provides fast MIME detection by extension or content. It uses the freedesktop.org MIME database provided by the shared-mime-info package. It also contains some extra magic to detect Microsoft Office 2007+ formats.
Homepage: https://github.com/minad/mimemagic
Version: 0.3.0+dfsg-1
Section: universe/ruby