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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https://bugs.launchpad.net/ubuntu/+source/crda/+bug/1376809/+subscriptions
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