$ sudo apt-get install virtualbox
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  dkms fakeroot libgsoap1 virtualbox-dkms virtualbox-qt
Suggested packages:
  virtualbox-guest-additions-iso vde2
The following NEW packages will be installed:
  dkms fakeroot libgsoap1 virtualbox virtualbox-dkms
  virtualbox-qt
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 18.3 MB of archives.
After this operation, 71.9 MB of additional disk space will be used.
Do you want to continue [Y/n]?
Get:1 http://it.archive.ubuntu.com/ubuntu/ precise/universe libgsoap1 amd64 2.8.4-2 [507 kB]
Get:2 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu/ precise/main virtualbox amd64 4.1.44-dfsg-1+deb7u1ubuntu1 [12.8 MB]
Get:3 http://it.archive.ubuntu.com/ubuntu/ precise-updates/main dkms all 2.2.0.3-1ubuntu3.6 [73.3 kB]
Get:4 http://it.archive.ubuntu.com/ubuntu/ precise/main fakeroot amd64 1.18.2-1 [87.2 kB]
Get:5 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu/ precise/main virtualbox-dkms all 4.1.44-dfsg-1+deb7u1ubuntu1 [503 kB]
Get:6 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu/ precise/main virtualbox-qt amd64 4.1.44-dfsg-1+deb7u1ubuntu1 [4,314 kB]
Fetched 18.3 MB in 4s (4,081 kB/s)
Selecting previously unselected package libgsoap1.
(Reading database ... 138535 files and directories currently installed.)
Unpacking libgsoap1 (from .../libgsoap1_2.8.4-2_amd64.deb) ...
Selecting previously unselected package virtualbox.
Unpacking virtualbox (from .../virtualbox_4.1.44-dfsg-1+deb7u1ubuntu1_amd64.deb) ...
Selecting previously unselected package dkms.
Unpacking dkms (from .../dkms_2.2.0.3-1ubuntu3.6_all.deb) ...
Selecting previously unselected package virtualbox-dkms.
Unpacking virtualbox-dkms (from .../virtualbox-dkms_4.1.44-dfsg-1+deb7u1ubuntu1_all.deb) ...
Selecting previously unselected package virtualbox-qt.
Unpacking virtualbox-qt (from .../virtualbox-qt_4.1.44-dfsg-1+deb7u1ubuntu1_amd64.deb) ...
Selecting previously unselected package fakeroot.
Unpacking fakeroot (from .../fakeroot_1.18.2-1_amd64.deb) ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
ureadahead will be reprofiled on next reboot
Processing triggers for hicolor-icon-theme ...
Processing triggers for shared-mime-info ...
Processing triggers for desktop-file-utils ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for gnome-menus ...
Setting up libgsoap1 (2.8.4-2) ...
Setting up virtualbox (4.1.44-dfsg-1+deb7u1ubuntu1) ...
 * Stopping VirtualBox kernel modules                   [ OK ]
 * Starting VirtualBox kernel modules                           * No suitable module for running kernel found
                                                        [fail]
invoke-rc.d: initscript virtualbox, action "restart" failed.
Setting up dkms (2.2.0.3-1ubuntu3.6) ...
Setting up virtualbox-dkms (4.1.44-dfsg-1+deb7u1ubuntu1) ...
Loading new virtualbox-4.1.44 DKMS files...
First Installation: checking all kernels...
Building only for 3.2.0-94-generic
Building initial module for 3.2.0-94-generic
Done.

vboxdrv:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.2.0-94-generic/updates/dkms/

vboxnetadp.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.2.0-94-generic/updates/dkms/

vboxnetflt.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.2.0-94-generic/updates/dkms/

vboxpci.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.2.0-94-generic/updates/dkms/

depmod....

DKMS: install completed.
 * Stopping VirtualBox kernel modules                   [ OK ]
 * Starting VirtualBox kernel modules                   [ OK ]
Setting up virtualbox-qt (4.1.44-dfsg-1+deb7u1ubuntu1) ...
Setting up fakeroot (1.18.2-1) ...
update-alternatives: using /usr/bin/fakeroot-sysv to provide /usr/bin/fakeroot (fakeroot) in auto mode.
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place


and then install the new kernel

sudo apt-get install linux-headers-generic-lts-trusty linux-image-generic-lts-trusty
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  linux-headers-3.13.0-68 linux-headers-3.13.0-68-generic
  linux-image-3.13.0-68-generic
Suggested packages:
  fdutils linux-lts-trusty-doc-3.13.0
  linux-lts-trusty-source-3.13.0 linux-lts-trusty-tools
The following NEW packages will be installed:
  linux-headers-3.13.0-68 linux-headers-3.13.0-68-generic
  linux-headers-generic-lts-trusty
  linux-image-3.13.0-68-generic
  linux-image-generic-lts-trusty
0 upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/66.5 MB of archives.
After this operation, 275 MB of additional disk space will be used.
Do you want to continue [Y/n]?
Selecting previously unselected package linux-image-3.13.0-68-generic.
(Reading database ... 139176 files and directories currently installed.)
Unpacking linux-image-3.13.0-68-generic (from .../linux-image-3.13.0-68-generic_3.13.0-68.111~precise1_amd64.deb) ...
Done.
Selecting previously unselected package linux-headers-3.13.0-68.
Unpacking linux-headers-3.13.0-68 (from .../linux-headers-3.13.0-68_3.13.0-68.111~precise1_all.deb) ...
Selecting previously unselected package linux-headers-3.13.0-68-generic.
Unpacking linux-headers-3.13.0-68-generic (from .../linux-headers-3.13.0-68-generic_3.13.0-68.111~precise1_amd64.deb) ...
Selecting previously unselected package linux-headers-generic-lts-trusty.
Unpacking linux-headers-generic-lts-trusty (from .../linux-headers-generic-lts-trusty_3.13.0.68.60_amd64.deb) ...
Selecting previously unselected package linux-image-generic-lts-trusty.
Unpacking linux-image-generic-lts-trusty (from .../linux-image-generic-lts-trusty_3.13.0.68.60_amd64.deb) ...
Setting up linux-image-3.13.0-68-generic (3.13.0-68.111~precise1) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.13.0-68-generic /boot/vmlinuz-3.13.0-68-generic
run-parts: executing /etc/kernel/postinst.d/dkms 3.13.0-68-generic /boot/vmlinuz-3.13.0-68-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.13.0-68-generic /boot/vmlinuz-3.13.0-68-generic
update-initramfs: Generating /boot/initrd.img-3.13.0-68-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.13.0-68-generic /boot/vmlinuz-3.13.0-68-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.13.0-68-generic /boot/vmlinuz-3.13.0-68-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.13.0-68-generic /boot/vmlinuz-3.13.0-68-generic
Generating grub.cfg ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-3.13.0-68-generic
Found initrd image: /boot/initrd.img-3.13.0-68-generic
Found linux image: /boot/vmlinuz-3.2.0-94-generic
Found initrd image: /boot/initrd.img-3.2.0-94-generic
Found memtest86+ image: /boot/memtest86+.bin
done
Setting up linux-headers-3.13.0-68 (3.13.0-68.111~precise1) ...
Setting up linux-headers-3.13.0-68-generic (3.13.0-68.111~precise1) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 3.13.0-68-generic /boot/vmlinuz-3.13.0-68-generic
Setting up linux-headers-generic-lts-trusty (3.13.0.68.60) ...
Setting up linux-image-generic-lts-trusty (3.13.0.68.60) ...

install an image without the headers (dkms fails because of no headers)
$ sudo apt-get install linux-image-generic-lts-saucy
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  linux-image-3.11.0-26-generic
Suggested packages:
  fdutils linux-lts-saucy-doc-3.11.0
  linux-lts-saucy-source-3.11.0 linux-lts-saucy-tools
  linux-headers-3.11.0-26-generic
The following NEW packages will be installed:
  linux-image-3.11.0-26-generic linux-image-generic-lts-saucy
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 57.7 MB of archives.
After this operation, 203 MB of additional disk space will be used.
Do you want to continue [Y/n]?
Get:1 http://it.archive.ubuntu.com/ubuntu/ precise-updates/main linux-image-3.11.0-26-generic amd64 3.11.0-26.45~precise1 [57.7 MB]
Get:2 http://it.archive.ubuntu.com/ubuntu/ precise-updates/main linux-image-generic-lts-saucy amd64 3.11.0.26.23 [2,376 B]
Fetched 57.7 MB in 6s (8,947 kB/s)
Selecting previously unselected package linux-image-3.11.0-26-generic.
(Reading database ... 168813 files and directories currently installed.)
Unpacking linux-image-3.11.0-26-generic (from .../linux-image-3.11.0-26-generic_3.11.0-26.45~precise1_amd64.deb) ...
Done.
Selecting previously unselected package linux-image-generic-lts-saucy.
Unpacking linux-image-generic-lts-saucy (from .../linux-image-generic-lts-saucy_3.11.0.26.23_amd64.deb) ...
Setting up linux-image-3.11.0-26-generic (3.11.0-26.45~precise1) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.11.0-26-generic /boot/vmlinuz-3.11.0-26-generic
run-parts: executing /etc/kernel/postinst.d/dkms 3.11.0-26-generic /boot/vmlinuz-3.11.0-26-generic
Error! Your kernel headers for kernel 3.11.0-26-generic cannot be found.
Please install the linux-headers-3.11.0-26-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.11.0-26-generic /boot/vmlinuz-3.11.0-26-generic
update-initramfs: Generating /boot/initrd.img-3.11.0-26-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.11.0-26-generic /boot/vmlinuz-3.11.0-26-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.11.0-26-generic /boot/vmlinuz-3.11.0-26-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.11.0-26-generic /boot/vmlinuz-3.11.0-26-generic
Generating grub.cfg ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-3.13.0-68-generic
Found initrd image: /boot/initrd.img-3.13.0-68-generic
Found linux image: /boot/vmlinuz-3.11.0-26-generic
Found initrd image: /boot/initrd.img-3.11.0-26-generic
Found linux image: /boot/vmlinuz-3.2.0-94-generic
Found initrd image: /boot/initrd.img-3.2.0-94-generic
Found memtest86+ image: /boot/memtest86+.bin
done
Setting up linux-image-generic-lts-saucy (3.11.0.26.23) ...