Bug#912073: No initramfs generated if new kernel package installed by upgrade

[Ben Hutchings <ben@decadent.org.uk>]

Package: pkgsel
Version: 0.60
Severity: serious

While testing a fix for #908711, I found that pkgsel diverts
update-initramfs during the upgrade and installation process
and runs it once at the end.

By default, "update-initramfs -u" updates the new initramfs for the
newest kernel version that update-initramfs was previously run for.
If a new kernel package was installed due to an ABI bump, no new
initramfs will be generated.  This causes the system to fail to
boot.

Ben.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled