Cannot install build essentials in 12.04 LTS

[oldos2er]

Okay.. Well worse case scenario I have a backup on another drive.. I'll give this a try. One quick question, how do I get the 40_custom back for later reference?

Did you create a backup copy before editing it? Always a good idea when editing system files. The default file is

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.

[BrokenLines]

Yes, that is what it is. But so far nothing has worked... I really need to fix this problem.

[oldos2er]

Not even the first command worked.

Can you please post the terminal output from the command(s)?

[BrokenLines]

Can you please post the terminal output from the command(s)?

Sure, here you go.

Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
grub-gfxpayload-lists : Depends: grub-pc (>= 1.99~20101210-1ubuntu2) but it is not going to be installed
grub-pc-bin : Depends: grub-common (= 1.99-21ubuntu3.6) but it is not going to be installed
grub2-common : Depends: grub-common (= 1.99-21ubuntu3.6) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).