The partition / dev/sda1, on which / (root) is mounted is overloaded, making it impossible to start the graphical server. Since you did not partition to mount / home (the folder where most of your files are stored) separately (from the output of the above and the fact that I assume you used the default values ubuntu-installer), we cannot know a priori where does the overload. So you should post the output of this command to see which files are occupying 147.8 GB.
Code:
du am | sort-nr | head -10
This command will display the size and location of the 10 largest files / directories of your accounts, in megabytes, by sorting them in descending order. You can also run that one if you want, it will display any file in your personnel file which is over 10M.
Code:
Console - Sélectionner find ~-size +10 M
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