Proxmox Mail Gateway Debian 10 remove old kernel package

1. Run below command in console to view currently installed kernel package.

dpkg -l | grep pve | awk '{print$2}'

2. Run below command in console to remove unwanted/old kernel package.

apt-get --purge remove pve-kernel-{version}-pve

3. Manually remove missing initrd.img and vmlinuz entry under /boot/pve.