** Description changed:

  System calls /etc/kernel/postinst.d/initramfs-tools when
  purging/removing a linux-image-extra package. That calls "update-
  initramfs -c" which needs significant amount of additional disk space in
  /boot temporarily. But there is no space left, if /boot is full.
  
+ Likewise /etc/kernel/postinst.d/dkms may call "update-initramfs -u".
+ 
  The fix could be to create the new initrg.img file in different partition 
before replacing the old one by it in update-initramfs. So the update-initramfs 
script should be fixed. But there may not be such a partition..
  Anyway the likely case when space runs out is when there is a separate /boot 
partition.
  
- Alternatively the init script should remove the respective 
/boot/initrd.img-<version> file when removing/installing the linux-image-extra 
package. That could also be done by
+ Alternatively the init scripts should remove the respective 
/boot/initrd.img-<version> file when removing/installing the linux-image-extra 
package. That could also be done by
  update-initramfs -d -k <version>
  
  Related question: http://askubuntu.com/q/898499/21005
  The output of 'dpkg --purge' presented there shows that corresponding 
linux-image package may get successfully removed while the linux-image-extra is 
left broken. If the linux-image-extra package will be removed later, the 
post-installation script will create an initrd.img file for a non-installed 
kernel! Same would happen, if removing would be done by apt-get purge.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: initramfs-tools 0.103ubuntu4.7
  ProcVersionSignature: Ubuntu 4.4.0-71.92~14.04.1-generic 4.4.49
  Uname: Linux 4.4.0-71-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.23
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Mar 31 17:42:35 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-21 (922 days ago)
  InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.1)
  PackageArchitecture: all
  SourcePackage: initramfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1678187

Title:
  Removing a linux-image-extra package fails, if /boot is about full

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