I am running Ubuntu Mate on a P13. Recently the Software Updater appeared and wanted to install some updates. Total ov 49.4 MB to be downloaded. No big deal. I told it to go ahead. I received the message:
Not enough free disk space
The upgrade needs a total of 48.2 M free space on disk '/boot'. Please free at least an additional 4,997 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 then ran apt-get update and apt-get upgrade. This worked fine:
The following packages will be upgraded:
apt apt-transport-https apt-utils bsdutils libapt-inst2.0 libapt-pkg5.0
libblkid1 libegl1-mesa libfdisk1 libgbm1 libgl1-mesa-dri libgl1-mesa-glx
libglapi-mesa libgles1-mesa libgles2-mesa libmount1 libsmartcols1 libuuid1
libwayland-egl1-mesa linux-firmware mount util-linux uuid-runtime
23 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 52.7 MB of archives.
After this operation, 95.2 kB of additional disk space will be used.
Do you want to continue? [Y/n]
I then called up Software Updater again. Nothing offered to upgrade so I guess my apt-get process got the same packages.
It looks to me like Software Updater is trying to download to /boot. I do NOT see any option to change this in the Settings dialog. Is there some place to change the download location?