The USE_TYPO_METRICS flag is not set in the OS/2 table of Latin Modern Math

Bug #1502701 reported by Fred-wang on 2015-10-04
This bug affects 3 people
Affects Status Importance Assigned to Milestone
lmodern (Debian)
Fix Released
lmodern (Ubuntu)

Bug Description

Dear Maintainer,

lmodern contains version 1.950 of the modern font. In this version, the USE_TYPO_METRICS flag is not set in the OS/2 table of Latin Modern Math, which can lead to excessive line spacing. See

This bug is fixed upstream, please upgrade to version 1.959:

This bug is also fixed in Debian:

[ Rationale: Starting with Gecko 31, the typo metrics are used when either USE_TYPO_METRICS is set or the font contains a MATH table. However, starting with Gecko 43, it will only be used when USE_TYPO_METRICS is explicitly set: ]

Changed in lmodern (Debian):
status: Unknown → Fix Released
Fred-wang (fred-wang) wrote :

FYI, more people reported this issue when reading Wikipedia pages on Ubuntu:

Jérôme Kunegis (kunegis) wrote :

I managed to fix the bug by hand on my Ubuntu installation by doing the following:

* Download the latest version of the Latin Modern Math font from
* You get a zipfile, unpack it. It contains documentation and a file 'latinmodern-math.otf'. Copy that file to ~/.fonts (which you must create if it doesn't exist yet)
* Restart Firefox

I'm using:
Ubuntu 14.04
Firefox 43.0
The MathML-fonts 2.1.1-signed plugin in Firefox
The MathML Font Settings 0.2.1-signed plugin in Firefox


David Venhoek (t-dav0d-a) wrote :

I can attest that this is (as of 29-06-2016) still an issue, and it makes mathematical reference material such as somewhat annoying to read. a fix would be highly appreciated

For reference, this is on Ubuntu 14.04.4 LTS

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lmodern (Ubuntu):
status: New → Confirmed
Mateus Araújo (iris-n) wrote :

This bug is fixed from Xenial onwards. I changed the status to Fix Released.

Changed in lmodern (Ubuntu):
status: Confirmed → Fix Released
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