Some times when you try to update a Ubuntu your /boot partition is full, with this how-to published by JorgeCode explain how to solve this step by step.

Go to JorgeCode article: How can I remove old kernels/install new ones when /boot is full?

Julian Bolivar-Galeno is an Information and Communications Technologies (ICT) Architect whose expertise is in telecommunications, security and embedded systems. He works in BolivarTech focused on decision making, leadership, management and execution of projects oriented to develop strong security algorithms, artificial intelligence (AI) research and its applicability to smart solutions at mobile and embedded technologies, always producing resilient and innovative applications.