Calibre is a comprehensive book library package.

I had the server running on my Ubuntu 14.04 system about 5 years ago. From memory the Calibre web interface was a bit unpolished, however some of my phone apps could access the library for easier book access.

I recently looked at my local library again because I wanted to reread some of my favorite books. I spent some time to clean the library up, but still need to spend more time.

The best solution is on the Calibre website Download for Linux

In any case some links to setup as a Linux server are as follows:

• From Calibre: The calibre Content server
• A bit dated from DigitalOcean: How To Create a Calibre Ebook Server on Ubuntu 20.04
• A personal source on Github: Calibre Server on Linux, based upon Nginx, but still OK.

When installing a Calbre server a key point seems to be that you install the full software package and ignore the warning / errors related to the client interface aspects of the install.