Try this:
edit /etc/schooltool/standard/schooltool.conf and ensure that reportlab_fontdir contains ubuntu-font-family, like this:
reportlab_fontdir /usr/share/fonts/truetype/ttf-liberation:/usr/share/fonts/truetype/ubuntu-font-family
and that the fonts are installed:
apt-get install fonts-ubuntu-font-family
Try this:
edit /etc/schooltool /standard/ schooltool. conf and ensure that reportlab_fontdir contains ubuntu-font-family, like this:
reportlab_fontdir /usr/share/ fonts/truetype/ ttf-liberation: /usr/share/ fonts/truetype/ ubuntu- font-family
and that the fonts are installed:
apt-get install fonts-ubuntu- font-family