If you still see a library reported as not found then something happened with your environment and/or how freesurfer is now setup to cause the error.  In that case, I recommend you delete the current FS_7_2_0_ubuntu_18_04_06 virtual machine from the VirtualBox client (choose to delete the files), setup the VM again, and when you first login check freeview again with the above commands.

When you want to process your own subject data we recommend you create a new directory in your home directory and set the environment variable SUBJECTS_DIR to point to it.  The install of freesurfer including the provided subject data is meant for reference and the files are in a protected system directory.  So it’s preferable to not modify and/or write files to where SUBJECTS_DIR points to out of the box.  Instead, just create a new directory for processing subjects with, e.g.,

developer@developer-VirtualBox:~$ cd $HOME

developer@developer-VirtualBox:~$ mkdir my_subjects

developer@developer-VirtualBox:~$ export SUBJECTS_DIR=$HOME/my_subjects

- and put your subject data to process in $HOME/my_subjects

- R.