Ubuntu: Software Updater complains about free space on `/boot`, `apt` on terminal doesn't


When trying to use the graphical application Software Updater on my raspi running Ubuntu Mate 16.04, I for about 10 days now receive an error message titled "Not enough free disk space" which says:

The upgrade needs a total of 48.2 M free space on disk '/boot'. Please free at least an additional 1,982 k of disk space on '/boot'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'.

According to df -h, I currently use 20 MiB on /boot and have 45 MiB available. So it's true that I don't have 48.2 MiB available.

sudo apt-get clean returns instantly with no output.

sudo apt autoremove doesn't find anything to remove.

Now I would find it perfectly understandable that /boot has too little space if it weren't for the fact that sudo apt upgrade runs through perfectly fine.

When I launch Software Updater immediately after I ran sudo apt upgrade, it checks for updates and then tells my that my software is up-to-date. But each time there are updates, it complains about the lack of storage space available on /boot. Why is this?

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