1. First we will install Dynagen and Python-Qt4

sudo apt-get install dynagen python-qt4

2. Download GNS3 and extract in /opt

cd /opt
sudo wget http://space.dl.sourceforge.net/project/gns-3/GNS3/0.7.2/GNS3-0.7.2-src.ta r.bz2
sudo tar -xjvf GNS3-0.7.2-src.tar.bz2 && rm GNS3-0.7.2-src.tar.bz2
sudo mv GNS3-0.7.2-src /opt/GNS3

3. Create the following directories:
These directories will be used by GNS3 – such as projects – where your working projects will be stored, cache, temp, IOS images, etc.

cd /opt/GNS3
sudo mkdir Dynamips
sudo mkdir IOS
sudo mkdir Project
sudo mkdir Cache
sudo mkdir tmp
sudo chmod o+rw -R ./Project
sudo chmod o+rw -R ./tmp

4. Download binary of dynamips and make it executable

cd Dynamips
sudo wget http://www.ipflow.utc.fr/dynamips/dynamips-0.2.8-RC2-x86.bin
sudo chmod +x ./dynamips-0.2.8-RC2-x86.bin

You can create a desktop shortcut by right-clicking on the desktop and select “Create Launcher..”, Name it GNS3 and in the command section type in

python "/opt/GNS3/gns3"

Double click to open GNS3 and we will edit the default settings. If you don’t want to use desktop icons you can create a launcher from your programs menu by right clicking on the Main Menu, selecting Edit Menu. Select New Item on the right and you will be presented with the same window where you type in the above. From there you can move the launcher into any menu section of your choice.

5. Go to edit | preferences and in the ‘Terminal command:’ section type in:

gnome-terminal -t %d -e 'telnet %h %p' > /dev/null 2>&1 &

6. Under ‘Paths’ change the ‘Project directory:’ to

/opt/GNS3/Project

and the ‘IOS/PIX directory:’ to

/opt/GNS3/IOS

7. Click on Dynamips tab on the left 

For the ‘Executable path:’ type in

/opt/GNS3/Dynamips/dynamips-0.2.8-RC2-x86.bin

8. Change the ‘Working directory:’ to

/opt/GNS3/tmp

Click on the Capture tab on the left

9. For the ‘Working directory for capture files:’ change it to

/opt/GNS3/Project 

10. Click on Qemu tab on the left 

Path to Qemuwrapper:

/opt/GNS3/qemuwrapper/qemuwrapper.py

Working Directory:

/opt/GNS3/tmp

  Procedemos a la descarga

sudo apt-get install autogen automake1.9 libtool
wget http://media-2.cacetech.com/wireshark/src/wireshark-1.4.0rc1.tar.bz2
tar xjvf wireshark-1.4.0rc1.tar.bz2
cd wireshark-1.4.0rc1
./autogen.sh
./configure

configure: error: I couldn't find yacc (or bison or ...); make sure it's installed and in your path

configure: error: I couldn't find flex; make sure it's installed and in your path

checking for GTK+ - version >= 2.4.0... no
*** Could not run GTK+ test program, checking why...
*** The test program failed to compile or link. See the file config.log for the
*** exact error that occured. This usually means GTK+ is incorrectly installed.
configure: error: GTK+ 2.4 or later isn't available, so Wireshark can't be compiled

checking for pcap.h... no
configure: error: Header file pcap.h not found; if you installed libpcap
from source, did you also do "make install-incl", and if you installed a
binary package of libpcap, is there also a developer's package of libpcap,
and did you also install that package?

Para arreglar el problema de las librerías faltantes instalamos lo siguiente:

sudo apt-get install bison flex libgtkmm-2.4-dev libpcap0.8-dev 

volvemos a configurar y obtenemos el siguiente resultado

 Install dumpcap with capabilities : no
             Install dumpcap setuid : no
                  Use dumpcap group : (none)
                    Use lua library : no
                 Use python binding : no
                   Build rtp_player : no
                        Use threads : no
             Build profile binaries : no
                   Use pcre library : no (using GRegex instead)
               Use kerberos library : no
                 Use c-ares library : no
               Use GNU ADNS library : no
                Use SMI MIB library : no
             Use GNU crypto library : no
             Use SSL crypto library : no
                 Use gnutls library : no
     Use POSIX capabilities library : no
                  Use GeoIP library : no

Instalamos las librerias faltantes para utilizar la mayor cantidad de opciones en wireshark

sudo apt-get install liblua5.1-dev libpcre3-dev libc-ares-dev libadns1-dev libsmi2-dev libgnutls-dev libgeoip-dev libportaudio-dev libcap2-dev

volvemos a configurar

./configure
make
sudo make install

  JDownloader ya está disponible para instalar desde los repositorios de Ubuntu, tan facil como:

• sudo add-apt-repository ppa:jd-team/jdownloader

• sudo apt-get update && sudo apt-get install jdownloader

  Para borrar un kernel antiguo se pueden seguir los siguientes pasos:

• verificar las versiones disponibles en nuestro sistema:

sudo dpkg -l | grep linux-image

• borrar las versiones antiguas que no utilizamos:

sudo apt-get remove --purge KERNEL

Donde KERNEL es la versión a eliminar, algo del estilo "linux-image-2.6.20-15-generic".