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[Bug 1554455] Re: "update-initramfs" is executed several times when you remove old kernels

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Yes, it does seem odd that all of the initrd.img files in /boot are
recreated from scratch just because I'm removing versions of the
kernel...

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https://bugs.launchpad.net/bugs/1554455

Title:
  "update-initramfs" is executed several times when you remove old
  kernels

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Here is an example. I had several old kernels:

  linux-image-3.19.0-49-generic
  linux-image-4.2.0-25-generic
  linux-signed-image-3.19.0-49-generic
  linux-signed-image-4.2.0-25-generic

  I used apt-get autoremove and here is the result:

  apt-get autoremove
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  The following packages will be REMOVED:
    grub-pc-bin linux-headers-3.19.0-49 linux-headers-3.19.0-49-generic
    linux-image-3.19.0-49-generic linux-image-4.2.0-25-generic
    linux-image-extra-3.19.0-49-generic linux-image-extra-4.2.0-25-generic
    linux-signed-image-3.19.0-49-generic linux-signed-image-4.2.0-25-generic
  0 upgraded, 0 newly installed, 9 to remove and 0 not upgraded.
  After this operation, 502 MB disk space will be freed.
  Do you want to continue? [Y/n] y
  (Reading database ... 211099 files and directories currently installed.)
  Removing grub-pc-bin (2.02~beta2-9ubuntu1.7) ...
  Removing linux-headers-3.19.0-49-generic (3.19.0-49.55~14.04.1) ...
  Removing linux-headers-3.19.0-49 (3.19.0-49.55~14.04.1) ...
  Removing linux-signed-image-3.19.0-49-generic (3.19.0-49.55~14.04.1) ...
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-3.19.0-49-generic
  Found initrd image: /boot/initrd.img-3.19.0-49-generic
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-3.19.0-49-generic
  Found initrd image: /boot/initrd.img-3.19.0-49-generic
  Found Windows Boot Manager on /dev/sda2@/EFI/Microsoft/Boot/bootmgfw.efi
  Found Ubuntu Xenial Xerus (development branch) (16.04) on /dev/mapper/VG-root
  Adding boot menu entry for EFI firmware configuration
  done
  Removing linux-image-extra-3.19.0-49-generic (3.19.0-49.55~14.04.1) ...
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.19.0-49-generic /boot/vmlinuz-3.19.0-49-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.19.0-49-generic /boot/vmlinuz-3.19.0-49-generic
  update-initramfs: Generating /boot/initrd.img-3.19.0-49-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 3.19.0-49-generic /boot/vmlinuz-3.19.0-49-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 3.19.0-49-generic /boot/vmlinuz-3.19.0-49-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.19.0-49-generic /boot/vmlinuz-3.19.0-49-generic
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-3.19.0-49-generic
  Found initrd image: /boot/initrd.img-3.19.0-49-generic
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-3.19.0-49-generic
  Found initrd image: /boot/initrd.img-3.19.0-49-generic
  Found Windows Boot Manager on /dev/sda2@/EFI/Microsoft/Boot/bootmgfw.efi
  Found Ubuntu Xenial Xerus (development branch) (16.04) on /dev/mapper/VG-root
  Adding boot menu entry for EFI firmware configuration
  done
  Removing linux-image-3.19.0-49-generic (3.19.0-49.55~14.04.1) ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.19.0-49-generic /boot/vmlinuz-3.19.0-49-generic
  update-initramfs: Deleting /boot/initrd.img-3.19.0-49-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.19.0-49-generic /boot/vmlinuz-3.19.0-49-generic
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found Windows Boot Manager on /dev/sda2@/EFI/Microsoft/Boot/bootmgfw.efi
  Found Ubuntu Xenial Xerus (development branch) (16.04) on /dev/mapper/VG-root
  Adding boot menu entry for EFI firmware configuration
  done
  Removing linux-signed-image-4.2.0-25-generic (4.2.0-25.30~14.04.1) ...
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found Windows Boot Manager on /dev/sda2@/EFI/Microsoft/Boot/bootmgfw.efi
  Found Ubuntu Xenial Xerus (development branch) (16.04) on /dev/mapper/VG-root
  Adding boot menu entry for EFI firmware configuration
  done
  Removing linux-image-extra-4.2.0-25-generic (4.2.0-25.30~14.04.1) ...
  depmod: FATAL: could not load /boot/System.map-4.2.0-25-generic: No such file or directory
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.2.0-25-generic /boot/vmlinuz-4.2.0-25-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.2.0-25-generic /boot/vmlinuz-4.2.0-25-generic
  update-initramfs: Generating /boot/initrd.img-4.2.0-25-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 4.2.0-25-generic /boot/vmlinuz-4.2.0-25-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 4.2.0-25-generic /boot/vmlinuz-4.2.0-25-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.2.0-25-generic /boot/vmlinuz-4.2.0-25-generic
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found Windows Boot Manager on /dev/sda2@/EFI/Microsoft/Boot/bootmgfw.efi
  Found Ubuntu Xenial Xerus (development branch) (16.04) on /dev/mapper/VG-root
  Adding boot menu entry for EFI firmware configuration
  done
  Removing linux-image-4.2.0-25-generic (4.2.0-25.30~14.04.1) ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.2.0-25-generic /boot/vmlinuz-4.2.0-25-generic
  update-initramfs: Deleting /boot/initrd.img-4.2.0-25-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.2.0-25-generic /boot/vmlinuz-4.2.0-25-generic
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found linux image: /boot/vmlinuz-4.2.0-30-generic
  Found initrd image: /boot/initrd.img-4.2.0-30-generic
  Found linux image: /boot/vmlinuz-4.2.0-27-generic
  Found initrd image: /boot/initrd.img-4.2.0-27-generic
  Found linux image: /boot/vmlinuz-3.19.0-51-generic
  Found initrd image: /boot/initrd.img-3.19.0-51-generic
  Found Windows Boot Manager on /dev/sda2@/EFI/Microsoft/Boot/bootmgfw.efi
  Found Ubuntu Xenial Xerus (development branch) (16.04) on /dev/mapper/VG-root
  Adding boot menu entry for EFI firmware configuration
  done

  apt has executed "update-initramfs" three times! Same for the grub
  (but here we have 6 times!). Looks like some triggers are not
  optimized.

  Didn't find duplicate but probably relates to these issues:
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/184852
  https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1505805
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=574336
  https://bugs.dogfood.paddev.net/ubuntu/+source/linux-ports-meta/+bug/303644
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/798414

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References

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