I tried to install all of the packages.  Synaptic Package Manager shows that they are all installed.  Unfortunately that didn't fix the issue.  Still no wired network.  It still shows that Wired Cable unplugged under the Network window.  (Note:  I am certain that the Ethernet cable that I am using is good because the same one plugged into another computer works fine).

Something to note though - I performed the install by typing in the dpkg for each package.  I received an error three times (same error).  It told me to check a log file.  The contents of the log file are below the attempted install of the 4 packages.  By the error, I can't tell whether the packages were all fully installed successfully.  I think that they probably were because they only seem to affect VirtualBox.

I have 2 questions:
Were the 4 packages installed successfully?
Should I keep these 4 packages installed or should I uninstall them?

Thanks for your time.

============================
Attempted install of the 4 packages:
scott@scott:~/Downloads$ sudo dpkg -i "linux-headers-3.7.0-030700rc2_3.7.0-030700rc2.201210220428_all.deb"
Selecting previously unselected package linux-headers-3.7.0-030700rc2.
(Reading database ... 188233 files and directories currently installed.)
Unpacking linux-headers-3.7.0-030700rc2 (from linux-headers-3.7.0-030700rc2_3.7.0-030700rc2.201210220428_all.deb) ...
Setting up linux-headers-3.7.0-030700rc2 (3.7.0-030700rc2.201210220428) ...
scott@scott:~/Downloads$ sudo dpkg -i linux-headers-3.7.0-030700rc2-generic_3.7.0-030700rc2.201210220428_amd64.deb
(Reading database ... 203088 files and directories currently installed.)
Preparing to replace linux-headers-3.7.0-030700rc2-generic 3.7.0-030700rc2.201210220428 (using linux-headers-3.7.0-030700rc2-generic_3.7.0-030700rc2.201210220428_amd64.deb) ...
Unpacking replacement linux-headers-3.7.0-030700rc2-generic ...
Setting up linux-headers-3.7.0-030700rc2-generic (3.7.0-030700rc2.201210220428) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
ERROR (dkms apport): kernel package linux-headers-3.7.0-030700rc2-generic is not supported
Error! Bad return status for module build on kernel: 3.7.0-030700rc2-generic (x86_64)
Consult /var/lib/dkms/virtualbox/4.1.18/build/make.log for more information.
scott@scott:~/Downloads$ sudo dpkg -i linux-image-3.7.0-030700rc2-generic_3.7.0-030700rc2.201210220428_amd64.deb
Selecting previously unselected package linux-image-3.7.0-030700rc2-generic.
(Reading database ... 203088 files and directories currently installed.)
Unpacking linux-image-3.7.0-030700rc2-generic (from linux-image-3.7.0-030700rc2-generic_3.7.0-030700rc2.201210220428_amd64.deb) ...
Done.
Setting up linux-image-3.7.0-030700rc2-generic (3.7.0-030700rc2.201210220428) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/dkms 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
ERROR (dkms apport): kernel package linux-headers-3.7.0-030700rc2-generic is not supported
Error! Bad return status for module build on kernel: 3.7.0-030700rc2-generic (x86_64)
Consult /var/lib/dkms/virtualbox/4.1.18/build/make.log for more information.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
update-initramfs: Generating /boot/initrd.img-3.7.0-030700rc2-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.7.0-030700rc2-generic
Found initrd image: /boot/initrd.img-3.7.0-030700rc2-generic
Found linux image: /boot/vmlinuz-3.5.0-17-generic
Found initrd image: /boot/initrd.img-3.5.0-17-generic
Found linux image: /boot/vmlinuz-3.2.0-32-generic
Found initrd image: /boot/initrd.img-3.2.0-32-generic
Found memtest86+ image: /boot/memtest86+.bin
done
scott@scott:~/Downloads$ sudo dpkg -i linux-image-extra-3.7.0-030700rc2-generic_3.7.0-030700rc2.201210220428_amd64.deb
Selecting previously unselected package linux-image-extra-3.7.0-030700rc2-generic.
(Reading database ... 203979 files and directories currently installed.)
Unpacking linux-image-extra-3.7.0-030700rc2-generic (from linux-image-extra-3.7.0-030700rc2-generic_3.7.0-030700rc2.201210220428_amd64.deb) ...
Setting up linux-image-extra-3.7.0-030700rc2-generic (3.7.0-030700rc2.201210220428) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/dkms 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
ERROR (dkms apport): kernel package linux-headers-3.7.0-030700rc2-generic is not supported
Error! Bad return status for module build on kernel: 3.7.0-030700rc2-generic (x86_64)
Consult /var/lib/dkms/virtualbox/4.1.18/build/make.log for more information.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
update-initramfs: Generating /boot/initrd.img-3.7.0-030700rc2-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.7.0-030700rc2-generic /boot/vmlinuz-3.7.0-030700rc2-generic
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.7.0-030700rc2-generic
Found initrd image: /boot/initrd.img-3.7.0-030700rc2-generic
Found linux image: /boot/vmlinuz-3.5.0-17-generic
Found initrd image: /boot/initrd.img-3.5.0-17-generic
Found linux image: /boot/vmlinuz-3.2.0-32-generic
Found initrd image: /boot/initrd.img-3.2.0-32-generic
Found memtest86+ image: /boot/memtest86+.bin
done

Error that showed up 3 times (from the above output):
scott@scott:~$ more /var/lib/dkms/virtualbox/4.1.18/build/make.log
DKMS make.log for virtualbox-4.1.18 for kernel 3.7.0-030700rc2-generic (x86_64)
Sat Oct 27 10:50:34 CDT 2012
make: Entering directory `/usr/src/linux-headers-3.7.0-030700rc2-generic'
  LD      /var/lib/dkms/virtualbox/4.1.18/build/built-in.o
  LD      /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/built-in.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/linux/SUPDrv-linux.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/SUPDrv.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/SUPDrvSem.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/alloc-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/initterm-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/memobj-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/mpnotification-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/powernotification-r0drv.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/assert-r0drv-linux.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/alloc-r0drv-linux.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/initterm-r0drv-linux.o
  CC [M]  /var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/memobj-r0drv-linux.o
/var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/memobj-r0drv-linux.c: In function ‘rtR0MemObjNativeMapUser’:
/var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/memobj-r0drv-linux.c:1451:38: error: ‘VM_RESERVED’ undeclared (first use in this function)
/var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/memobj-r0drv-linux.c:1451:38: note: each undeclared identifier is reported only once for each function
 it appears in
make[2]: *** [/var/lib/dkms/virtualbox/4.1.18/build/vboxdrv/r0drv/linux/memobj-r0drv-linux.o] Error 1
make[1]: *** [/var/lib/dkms/virtualbox/4.1.18/build/vboxdrv] Error 2
make: *** [_module_/var/lib/dkms/virtualbox/4.1.18/build] Error 2
make: Leaving directory `/usr/src/linux-headers-3.7.0-030700rc2-generic'