This mode change is "by design". For local admins that what to relax
this restriction, you can use dpkg-statoverride:
sudo dpkg-statoverride --add root root 0644 /boot/vmlinux-$(uname -r)
--update
To have this automatically happen with each new kernel, create
/etc/kernel/postinst.d/statoverride:
#!/bin/sh
version="$1"
# passing the kernel version is required
[ -z "${version}" ] && exit 0
dpkg-statoverride --add root root 0644 /boot/vmlinux-${version} --update
** Changed in: linux (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/759725
Title:
The kernel is no longer readable by non-root users
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