Indico uses LaTeX (xelatex to be exact) to generate some PDF files such as the Book of Abstracts and the PDF versions of contributions. If you do not need these features, you can skip this part of the documentation and avoid installing LaTeX altogether.

Since Indico requires quite a few LaTeX packages which are not always installed by default when using the texlive packages of the various linux distributions, we recommend installing it manually.


If you know what you’re doing, feel free to try using your distribution’s “full” texlive package (often named texlive-full, texlive-scheme-full, or similar) instead of using the texlive installer.

However, e.g. on Alma9 there are some LaTeX packages missing which Indico needs. A possible workaround for this (which works fine) is using the packages from Fedora 34, but this is not straightforward at all.

First of all, you will need to install some dependencies so that all TeX formats are generated successfully upon TeXLive installation.

# If you use Alma or Rocky:
dnf install perl ghostscript fontconfig wget
# If you use Debian or Ubuntu:
apt install perl ghostscript libfontconfig1

You are now ready to install TeXLive. The following commands should work fine to install everything you need. You need to run the installation as root or create /opt/texlive as root and grant your user write access to it.

Download the installer and cd to its location (the directory name contains the date when the package was built, so use the wildcard or type the name manually based on the output when unpacking the archive):

cd /tmp
tar xvzf install-tl-unx.tar.gz
cd install-tl-*/

Create the setup config file to install all the packages you need:

cat > texlive.profile <<'EOF'
selected_scheme scheme-full
TEXDIR /opt/texlive
TEXMFCONFIG ~/.texlive/texmf-config
TEXMFLOCAL /opt/texlive/texmf-local
TEXMFSYSCONFIG /opt/texlive/texmf-config
TEXMFSYSVAR /opt/texlive/texmf-var
TEXMFVAR ~/.texlive/texmf-var
binary_x86_64-linux 1
instopt_adjustpath 0
instopt_adjustrepo 0
instopt_letter 0
instopt_portable 0
instopt_write18_restricted 1
tlpdbopt_autobackup 1
tlpdbopt_backupdir tlpkg/backups
tlpdbopt_create_formats 1
tlpdbopt_generate_updmap 0
tlpdbopt_install_docfiles 0
tlpdbopt_install_srcfiles 0
tlpdbopt_post_code 1
tlpdbopt_sys_bin /usr/local/bin
tlpdbopt_sys_info /usr/local/share/info
tlpdbopt_sys_man /usr/local/share/man

Start the installer and wait for it to complete. This may take between a few minutes and a few hours depending on the speed of the (randomly chosen) mirror.

./install-tl --profile texlive.profile

After installing it, add this line to your indico.conf file to use your new TeXLive installation:

XELATEX_PATH = '/opt/texlive/bin/x86_64-linux/xelatex'

If you are in a production setup, reload uWSGI using touch /opt/indico/web/indico.wsgi to reload the config file.

As security-related updates are released frequently, it is also a good idea to periodically update the TeXLive packages by running:

/opt/texlive/bin/x86_64-linux/tlmgr update --self --all