On 01/08/2021 13:34, didier gaumet wrote: > Hello, > > Disclaimer: I have never tested what is following. > > Perhaps another way of keeping two kernels without increasing the size oft the /boot partition would be to decrease the size of the initrd files: by default they are built with allmost all possible modules, but they can be built with only the modules that are needed (for the hardware which is automatically detected). That is, if Ubuntu acts as Debian in this regard (Debian here) > > As root or via sudo: > 1) edit the /etc/initramfs-tools/initramfs.conf file to replace the MODULES=most line by a MODULES=dep one > 2) to make room in /boot for the following step, delete the big initrd images: > # rm /boot/initrd* > 3) generate smaller initrd images > # update-initramfs -c -k all > > Next time there is a kernel update, the initrd will automatically be generated with a smaller size (but you will perhaps have to make room for it if you have not enough space for three kernels) Another avenue to try is changing the compression used. I see the OP uses lz4 compression, XZ and Zstd compression often give better results but this is definitely a "Your Mileage May Vary" situation. As with the "MODULES" option above, you can configure the compression with the "COMPRESS" option. >
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