Hmm, weird, because the Ubuntu setup tends to be pretty stable...
Just to doublecheck, can you perhaps make sure that all dependencies are present, by copy+pasting these commands:
sudo apt-get update
sudo apt-get install -y tcsh xfonts-base libssl-dev \
python-is-python3 \
python3-matplotlib python3-numpy \
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 \
r-base-dev cmake \
libgdal-dev libopenblas-dev \
libnode-dev libudunits2-dev \
libgfortran4
which come from here:
https://afni.nimh.nih.gov/pub/dist/doc/htmldoc/background_install/install_instructs/steps_linux_ubuntu20.html#slow-setup-install-prerequisite-packages
?
Thanks,
pt