The error message I get suggests "sudo apt-get clean"
I try running it but nothing happens. Just get back to the prompt.
Is there any other terminal commands I should try to clean temporary files out of my boot partition?
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I found my answer here. Not enough free disk space when upgrading
It told me how to delete multiple old kernels at once which after some effort and thought, this isn't my thing, cleaned up my boot partition.
I'm still a little nervous that this might not boot after I shut down but I'm taking that chance and leaving this here in case I don't make it back.
Well it worked. The link above provides the code and info required to eliminate the old kernels that are clogging up any boot partition.