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I am running Ubuntu MATE on a Raspberry Pi. It is a pretty fresh install from Ubuntu MATE. I tried to run sudo do-release-upgrade but received the following message:

    Not enough free disk space

The upgrade has aborted. The upgrade needs a total of 49.5 M free
space on disk '/boot'. Please free at least an additional 5,390 k of
disk space on '/boot'. You can remove old kernels using 'sudo apt
autoremove' and you could also set COMPRESS=xz in
/etc/initramfs-tools/initramfs.conf to reduce the size of your
initramfs.

I tried the suggestions noted in warning to not avail. I referenced this question, but none of it appeared to work either. Running dpkg -l | grep linux-image returns nothing. Looking at the output of df -h, I understand the problem (there is only 43M available on boot), but what I am less certain of is what I can do to make room. There do not appear to any old kernels, and autoremove did not work. What else can I do to clean /boot and make room.

Thanks.

EDIT:

Sorry, I meant to actually show the output of df -h:

    pi@kb-pi:/boot/grub$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        15G  4.0G   11G  28% /
devtmpfs        459M     0  459M   0% /dev
tmpfs           463M  452K  463M   1% /dev/shm
tmpfs           463M   13M  451M   3% /run
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           463M     0  463M   0% /sys/fs/cgroup
/dev/mmcblk0p1   63M   21M   43M  34% /boot
tmpfs            93M   32K   93M   1% /run/user/1000
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    That is a really small boot partition, I'd never make one less than 512MB to be honest, any chance you can power down the pi, load up the card in a GUI environment on your computer, resize the partitions around, then try and redo the updates? Because a 64MB boot partition is probably enough for one kernel at most and likely not enough for an update...
    – Thomas Ward
    Dec 5 '18 at 17:19
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You can dynamically increase the size of your boot partition:

How to dynamically increase a Linux partition

Hope this helps :)

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