Fonts for matplotlib
--------------------

Install Humor Sans font
```
sudo apt install fonts-humor-sans
```

Clear matplotlib font cache:
```
cd ~/.cache/matplotlib/
rm -r *
```

Older problems
--------------

Make sure the right fonts are installed:
```
sudo apt-get install ttf-lyx2.0 
```
There is some conflict with `lyx` fonts, so we first remove them
and remove the matplotlib font cache:
```
sudo dpkg --remove --force-depends fonts-lyx
rm ~/.cache/matplotlib/fontList.cache
# rm ~/.matplotlib/fontList.cache     # older ubuntus
```
Then we need to plot something to recreate the matplotlib font cache:
```
make cleanplots
make plots
```

You should better NOT reinstall
```
sudo apt-get install fonts-lyx 
```
to give back the fonts to lyx.