I was looking into the same thing
It seems like this is intentional
I'm on this version
lsb_release -a
LSB Version:
core-11.1.0ubuntu2-noarch:printing-11.1.0ubuntu2-noarch:security-11.1.0ubuntu2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal
It appears apt is configured to never autoremove kernels
/etc/apt/apt.conf.d/01autoremove
NeverAutoRemove
{
"^firmware-linux.*";
"^linux-firmware$";
"^linux-image-[a-z0-9]*$";
"^linux-image-[a-z0-9]*-[a-z0-9]*$";
};
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https://bugs.launchpad.net/bugs/1779657
Title:
apt autoremove not removing old kernels
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