thanks for the fast reply, I run testing:
lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.0 (stretch)
Release: 9.0
Codename: stretch
In my TeX log it says:
LaTeX2e <2016/03/31> patch level 3
I thought of upgrading this package to unstable but stopped as it
says here [1] that even the sid packages have the same version number, which
I have installed according to synaptic. synaptic also says that there is
no newer release. I also purged and reinstalled texlive-full, but didn't
help. Should I upgrade the LaTeX packages to unstable then? Or have I
just configured something wrongly?