[Bug 798414] Re: update-initramfs should produce a more helpful error when there isn't enough free space

[equivalent8]

mine df

```
 df
Filesystem     1K-blocks      Used Available Use% Mounted on
udev             3997848         0   3997848   0% /dev
tmpfs             803444     10096    793348   2% /run
/dev/dm-1      237116104 208916688  16131576  93% /
tmpfs            4017208      6892   4010316   1% /dev/shm
tmpfs               5120         4      5116   1% /run/lock
tmpfs            4017208         0   4017208   0% /sys/fs/cgroup
/dev/nvme0n1p2    241965    117520    111953  52% /boot
/dev/nvme0n1p1    523248      3456    519792   1% /boot/efi
cgmfs                100         0       100   0% /run/cgmanager/fs
tmpfs             803444        56    803388   1% /run/user/1000
```

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https://bugs.launchpad.net/bugs/798414

Title:
  update-initramfs should produce a more helpful error when there isn't
  enough  free space

Status in initramfs-tools:
  Confirmed
Status in initramfs-tools package in Ubuntu:
  In Progress

Bug description:
  Binary package hint: initramfs-tools

  When generating a new initramfs there is no check for available free
  space, subsequently its possible for update-initramfs to fail due to a
  lack of free space.  This is resulting in package installation
  failures for initramfs-tools.  For example:

  Setting up initramfs-tools (0.98.8ubuntu3) ...
  update-initramfs: deferring update (trigger activated)
  Processing triggers for initramfs-tools ...
  update-initramfs: Generating /boot/initrd.img-2.6.38-8-generic

  gzip: stdout: No space left on device
  E: mkinitramfs failure cpio 141 gzip 1
  update-initramfs: failed for /boot/initrd.img-2.6.38-8-generic
  dpkg: error processing initramfs-tools (--configure):
   subprocess installed post-installation script returned error exit status 1

  WORKAROUND:

  Remove unused kernels using computer janitor (not in repositories for
  14.04 or later) or manually free space on your partition containing
  the /boot file system.

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