Software⏱️ 3 min read📅 2026-06-11

How to Fix: Matplotlib font_manager.py font finding error

Matplotlib font_manager.py font finding error on Ubuntu 12.04 machine.

Quick Answer: Try updating matplotlib to the latest version, as the issue seems to be related to an outdated font list.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

The user on a Ubuntu 12.04 machine is experiencing an error when plotting with Matplotlib, specifically a font finding error that prevents the display of monospaced fonts.

This issue can be frustrating as it affects the appearance of plots and may require significant adjustments to achieve the desired look.

🔍 Why This Happens

  • The primary reason for this error is the incomplete or incorrect configuration of the font manager in Matplotlib. In particular, the 'font.sans-serif' property is set to a list that includes both serif and sans-serif fonts, which can cause confusion for the font manager.
  • An alternative reason could be the presence of missing or invalid font files on the system, particularly the 'Bitstream Vera Sans' font which is mentioned in the error message.

✅ Best Solutions to Fix It

Configuring the font manager

  1. Step 1: Step 1: Update the 'font.sans-serif' property to only include sans-serif fonts. This can be done by removing the 'serif' suffix from the list of fonts, for example: font.sans-serif : Bitstream Vera Sans
  2. Step 2: Step 2: Check if the required font files are present on the system and ensure they are not corrupted or missing.
  3. Step 3: Step 3: If the issue persists, try deleting the cache files in ~/.matplotlib/ and re-running matplotlibrc to reset the configuration.

Installing additional fonts

  1. Step 1: Step 1: Install the required font files using a package manager such as apt-get. For example, install the 'bitstream-vera-sans' package.
  2. Step 2: Step 2: Update the 'font.sans-serif' property to include the newly installed fonts.

✨ Wrapping Up

To resolve this issue, it is recommended to configure the font manager correctly by updating the 'font.sans-serif' property and ensuring that the required font files are present on the system. If additional fonts need to be installed, use a package manager to install them and update the configuration accordingly.

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