External Email - Use Caution        

SyntaxError: Missing parentheses in call to 'print'. Did you mean print('ERROR: 
atleast 1 subject must be provided')?It does not look like you are running a 
python 2.X.  That may be because only python3 is installed by default.
$ which python
$ which python2
$ which python3
/bin/python3

… if you need to install python2, you can do it with ...
$ sudo apt update$ sudo apt install python2
$ which python2/bin/python2$ python2 --version
Python 2.7.18

One way or another you need “python” to report it is a 2.X version *after* you 
set FREESURFER_HOME and source the freesurfer setup script.  To force 
“python” to run as “python2” you can try using an alias,
$ alias python=python2$ python --version
Python 2.7.18

Similarly, if you needed python to run as python3 you could reset the alias to 
use =python3 instead.
For the error, 
 print 'ERROR: subjects are not specified (use --subjects SUBJECTS)’I 
would check the subjects you are listing as argument can be found as 
directories under what SUBJECTS_DIR is currently set to.
- R.

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