unattended-upgrade recently automatically upgrade my kernel to 4.4.0-143 but it does not work with Nvidia graphic cards so I decided to roll back to previous version.
I am able to boot to an older kernel(4.4.0-141), and confirmed I'm booting my computer with that:
but when I tried to
apt purge linux-image-4.4.0-143-generic, apt prompts me to confirm:
The following NEW packages will be installed: linux-image-unsigned-4.4.0-143-generic
So why is uninstalling a signed kernel requires to install an unsigned version? And how can I safely remove the newer(143) kernel? Thanks in advance!
full output of apt purge:
Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: amd64-microcode intel-microcode iucode-tool linux-headers-4.4.0-137 linux-headers-4.4.0-137-generic linux-headers-4.4.0-138 linux-headers-4.4.0-138-generic linux-headers-4.4.0-139 linux-headers-4.4.0-139-generic linux-headers-4.4.0-141 linux-headers-4.4.0-141-generic linux-image-4.4.0-137-generic linux-image-4.4.0-138-generic linux-image-4.4.0-139-generic linux-image-4.4.0-141-generic linux-image-extra-4.4.0-137-generic linux-image-extra-4.4.0-138-generic linux-image-extra-4.4.0-139-generic linux-image-extra-4.4.0-141-generic linux-signed-image-4.4.0-137-generic linux-signed-image-4.4.0-138-generic linux-signed-image-4.4.0-139-generic linux-signed-image-4.4.0-141-generic thermald Use 'sudo apt autoremove' to remove them. The following additional packages will be installed: linux-image-unsigned-4.4.0-143-generic Suggested packages: fdutils linux-doc-4.4.0 | linux-source-4.4.0 linux-tools The following packages will be REMOVED: linux-generic* linux-image-4.4.0-143-generic* linux-image-generic* linux-signed-generic* The following NEW packages will be installed: linux-image-unsigned-4.4.0-143-generic 0 upgraded, 1 newly installed, 4 to remove and 140 not upgraded. Need to get 7,049 kB of archives. After this operation, 386 kB of additional disk space will be used. Do you want to continue? [Y/n] n