muthana@muthana-desktop:~$ sudo apt-get install build-essential
Reading package lists... Done
Building dependency tree... Done
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
bmp-docklet: Depends: beep-media-player but it is not going to be installed
build-essential: Depends: libc6-dev but it is not going to be installed or
libc-dev
Depends: gcc (>= 4:4.0) but it is not going to be installed
Depends: g++ (>= 4:4.0) but it is not going to be installed
checkgmail: Depends: libgtk2-trayicon-perl but it is not going to be installed
Depends: libwww-perl but it is not going to be installed
Depends: libcrypt-ssleay-perl but it is not going to be installed
Depends: libxml-simple-perl but it is not going to be installed
Depends: libcrypt-blowfish-perl but it is not going to be installe d
Depends: libfreezethaw-perl but it is not going to be installed
Depends: libcompress-zlib-perl but it is not going to be installed
libcrypt-simple-perl: Depends: libcompress-zlib-perl but it is not going to be installed
Depends: libcrypt-blowfish-perl but it is not going to b e installed
Depends: libemail-mime-encodings-perl but it is not goin g to be installed
Depends: libmd5-perl but it is not going to be installed
Depends: libfreezethaw-perl but it is not going to be in stalled
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a s olution).
muthana@muthana-desktop:~$

sudo apt-get -f install build-essential

muthana@muthana-desktop:~$ sudo apt-get -f install build-essential
Reading package lists... Done
Building dependency tree... Done
The following extra packages will be installed:
cpp cpp-4.0 g++ g++-4.0 gcc gcc-4.0 libc6-dev libstdc++6-4.0-dev
linux-kernel-headers
Suggested packages:
cpp-doc gcc-4.0-locales gcc-4.0-doc lib64stdc++6 manpages-dev autoconf
automake1.9 libtool flex bison gcc-doc libc6-dev-amd64 lib64gcc1 glibc-doc
libstdc++6-4.0-doc stl-manual
Recommended packages:
libmudflap0-dev
The following NEW packages will be installed:
build-essential cpp cpp-4.0 g++ g++-4.0 gcc gcc-4.0 libc6-dev
libstdc++6-4.0-dev linux-kernel-headers
0 upgraded, 10 newly installed, 0 to remove and 2 not upgraded.
Need to get 10.1MB of archives.
After unpacking 38.2MB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
linux-kernel-headers libc6-dev cpp-4.0 cpp gcc-4.0 gcc libstdc++6-4.0-dev
g++-4.0 g++ build-essential
Install these packages without verification [y/N]?

sudo apt-get -f install

root@muthana-desktop:/home/muthana# apt-get -f install
E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
root@muthana-desktop:/home/muthana#