Hi, Christine-
OK, it looks like the symbolic link exists. Just to verify it, what is the output of:
ls -l /usr/lib/x86_64-linux-gnu/libgsl.so.23
?
Since the GSL link exists, I wonder if the problem is with the GSL installation itself. I also find it odd that you would have to install libglu1 separately, because the main installation command has "libglu1-mesa-dev" as part of its installation, and I would just assume that plain ol' libglu1 would be a dependency of that... Just to rule out something like that, could you please run these three commands again via copy+paste into the terminal:
sudo add-apt-repository universe
sudo apt-get update
(This is the main installation command *without* the R part, because you have been working on that separately):
sudo apt-get install -y tcsh xfonts-base libssl-dev \
python-is-python3 \
python3-matplotlib \
gsl-bin netpbm gnome-tweak-tool \
libjpeg62 xvfb xterm vim curl \
gedit evince eog \
libglu1-mesa-dev libglw1-mesa \
libxm4 build-essential \
libcurl4-openssl-dev libxml2-dev \
libgfortran-8-dev libgomp1 \
gnome-terminal nautilus \
gnome-icon-theme-symbolic \
firefox xfonts-100dpi
If you run afni_system_check.py after that, are there still errors?
--pt
