I need to free some space on my drive:
Not enough free disk space: The upgrade has aborted. The upgrade needs a total of 2,807 M free space on disk '/'. Please free at least an additional 1,396 M of disk space on '/'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'.
It's different from How do I free up disk space?, as the solutions for that question weren't sufficient