The license file (“license.txt”) is easy to get, so don’t worry if you don’t have an existing license. Just ask follow the link to fill in the form to request another one if you are setting up on a new system.
Use the Ubuntu “DEB installer” download
Before installing the freesurfer download, install the dependencies (https://surfer.nmr.mgh.harvard.edu/fswiki/BuildRequirements ) .
Note: use apt rather than apt-get
It is not unusual for these commands to not work as listed. So, go through these steps from a terminal (“#” is for comments):
...
Look for names of packages not installed, and install those. This is a hunt. Make sure you DO NOT run apt In order to install new packages, yuo’ll need to uninstall freesurfer -
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sudo apt --fix-broken |
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install |
Then install what you need
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sudo apt-get -y install xorg-dev sudo apt-get -y install gettext sudo apt-get -y install csh |
Who knows, yuo might want to run these two
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sudo apt --fix-broken install
sudo apt autoremove |
However, we might want to use gdebi because unlike dpkg it resolves dependencies
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sudo apt install gdebi |
However, this does nto work. We need the libbrotli1 library. So 
https://github.com/google/brotli
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sudo apt-get install curl zip unzip tar |
From here, we can install the latest brotli, which has that library. However, the package manager does not recognize the updated version. Thus, we are left to abandon the *.deb route.