Not sure what happened here, but running Freesurfer on Ubuntu and not getting this error when trying to view volumes:

freeview -v \
mri/T1.mgz \
mri/brainmask.mgz \
mri/wm.mgz:visible=0 \
mri/aseg.mgz:colormap=lut:opacity=0.2 \
-f surf/lh.white:edgecolor=blue \
surf/rh.white:edgecolor=blue \
surf/rh.pial:edgecolor=red \
surf/lh.pial:edgecolor=red \
surf/rh.inflated:visible=0 \
surf/lh.inflated:visible=0

But it get the error:

bash: mri/T1.mgz: Permission denied

No idea why or how to fix this. I have also tried other subjects but same thing.