Synaptic won't work

more: when I trie to install 'em, Synaptic downloads and installs, but when I go to the menu, they don't appear, Symaptic says It's installed...

Not every program will make an entry in the Menu.

Try opening a terminal and inputting the name to see if it starts from there.

You might have to manually edit the menu to create an item.

Aeham... well... maybe it's just because lots of apps are command line applications thus simply unix utils. For example I installed "tree" last night via "sudo apt-get install tree". The app installed successfully and I can run it, but there's not starter neither on the desktop nor within my applications menue.

I tried running "p7zip" in a terminal and it said: "compressed data not written to a terminal."

any other idea??

That means that the p7zip is installed. from the console type:
 man p7zip
Hope this helps, let me know

Ok,

see p7zip is a port of 7za.exe for POSIX systems like Unix (Linux, Solaris, OpenBSD, FreeBSD, Cygwin, AIX, ...) and thus should normally accept input and output via your shell (as well as some command line arguments).

The problem here is that the output did not get stright to your shell (which is probably the better way). Some programms like "dd" have a different behaviour which makes things more complex.

If you want to assemble some data to an archive (tarball) and compress it afterwards I recommend you Linux tools which are already »onboard«. There are also some GUIs for these. It's possible to create tarballs with ease then and compress 'em with several compression methods (*.tgz / *.tbz(2)).

To avoid problems with the command line regarding p7zip I recomend you http://peazip.sourceforge.net/ which provides you with a GUI for this free P7ZIP unix port. ;-)

Aquina: I didn't understand a word, I don't speak very well enflish, I speak spanish...

could someone traduce it?

I'll download the program, how do I install it?

aniway... how do I run p7zip??

Ok marce. Veamos, según parece has instalado p7zip correctamente.
Una forma más sencilla de instalar 7zip es a través de Añadir y quitar...
pones 7zip en buscar y te aparecerá.
Para ejecutarlo, desde la línea de comandos ingresa:
 7z
y para mejor comprensión puedes ingresar:
 man p7zip
y te mostrará información acerca de cómo usarlo.

Lo que Aquina te recomienda (y yo también) es utilizar alguna interfaz visual para evitar problemas con la línea de comandos, el enlace de Aquina http://peazip.sourceforge.net/ te lleva a la descarga de una interfaz gráfica para p7zip (que desafortunadamente no posee traducción al español).
Espero que sirva

arochester's reply helped me too - found hal-applesmc etc in terminal. A warning in synaptics that not everything is found there would be welcome!

Does p7zip work now, marce?

Unfortunately I do not have the powers to change the state of this question to SOLVED, EXPIRED or INVALID. Someone here at Launchpad either grant me that permission or simply apply the change in state to this question, please.