The package is optional because it is not required on a VM for instance.
If you read the output of the apt-get remove crda command you will
notice it is proposing to remove the larger part of your kernel (linux-
image-extra) which contains all of your hardware drivers, and explains
the panic on next boot:

  $ sudo apt-get remove crda
  [sudo] password for mru: 
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  The following extra packages will be installed:
    crda:i386 gcc-4.9-base:i386 libc6:i386 libgcc1:i386 libnl-3-200:i386
    libnl-genl-3-200:i386 libssl1.0.0:i386 wireless-crda
  Suggested packages:
    glibc-doc:i386 locales:i386
  The following packages will be REMOVED
    crda linux-generic linux-image-extra-3.13.0-36-generic linux-image-generic
  The following NEW packages will be installed
    crda:i386 gcc-4.9-base:i386 libc6:i386 libgcc1:i386 libnl-3-200:i386
    libnl-genl-3-200:i386 libssl1.0.0:i386 wireless-crda
  0 to upgrade, 8 to newly install, 4 to remove and 0 not to upgrade.
  Need to get 4,922 kB of archives.
  After this operation, 139 MB disk space will be freed.
  Do you want to continue? [Y/n] n
  $

If you have an older kernel installed you should be able to boot into
grub (hold shift during very early boot) and select the older kernel.
>From there you should be able reinstall the kernel "apt-get install
linux-image-generic".

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https://bugs.launchpad.net/bugs/1376809

Title:
  Kernel Panic After Removing Package crda

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