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Friday, April 30, 2010

VNC remote desktop

To acces a remote desktop on a ubuntu machine read here what you should do.

Leo cardinaal explains

.

What to do when Ubuntu 10.4 is installed

I found a very comprehensive manual for everyone who's installing Ubuntu 10.4 Lucid Lynx

Its here and only in Dutch:

Instalatie tips

Wednesday, April 28, 2010

More than one X session

In a separate console screen (CTRL - ALT - F1 to F6 ) You can login on the command prompt. When you're logged in, you can give the startx command to start a X windows session.

Switch to another console mode by pressing CTRL+ALT+F1. Provide your login details and type the following command to start X session:
startx -- :1

The default X session runs on screen 0. However, you can run the more X sessions on screen 1, screen 2, and so on. The above startx command tell X to run on screen 1. To run X on screen 2, you'd use the command
startx -- :2

To go back to the screen 0 user X session, press CTRL+ALT+F7
Please note that CTRL - ALT - F7 to F12 identify six X sessions.

Monday, April 19, 2010

Wireless networking in Ubuntu

I found an interesting website with additional information about Lynksys networking cards in Ubuntu:

Linux wireless Hardware wireless supprted cards
and
Linux USB wireless sticks
Linux ubuntu hardware
Ununtu Help
WPA information
WICD alternative network manager
9lives
ubuntuforums
rfswitch.sourceforge
In Ubuntu 9.10 the standard GNOME network-manager doesn´t work very easily with wifi networks that are WPA encrypted. In Ubuntu 10.4 everything worked just out of the box.

Read my story here:

I got a Linksys WPC300N PCMCIA network card in my old laptop. It is working in Ubuntu 9.10 with the build in driver, but only after I did some finetuning. My version is 2 and uses an Atheros chipset. The linux driver is the Ath9k driver thats loaded automatically with the Kernel.

First type in a console: lspci
Your network card should be mentioned. That means the hardware is accepted.
Mine says
20.00.0 network controller Atheros Communications Inc. AR5008 Wireless Network Adapter

now type lshw
It should write down tour networkcards. In the *network section look for Wireless interface Look for a line containing
configuration: ..... driver=ath9k ....

If this is the same with your system, you know that the hardware is seen and the appropriate driver is loaded.
If it doesn´t, you should google the internet about ndiswrapper

In my system I made a connection in the network applet by filling in the WPA key. I discovered that the key shouldn'tbe too long. Mine is ten characters now.

Then the connection still didn't work, allthough I could see the available networks in the air. Then I read a posting saying that this device shouldn't be unmanaged. This happens when you have it configured in /etc/network/interfaces and use Network-Manager in unmanaged mode.
I read suggestions to change managed=false to managed=true in
/etc/NetworkManager/nm-system-settings.conf .
If that doesnt help, try to remove your configurations from
/etc/network/interfaces and let NetworkManager manage your connection
in the good old way.
(To edit these config files I start from a terminal gksu gedit (or kdesu kate))

This latter option worked for me after I simply renamed /etc/network/interfaces to /etc/network/interfaces.backup, but the connection isn't stable. The first evening it worked all fine. The next day it didn't. The system starts reconnecting.
Then I did something very different. I installed wicd. just look for it in synaptic.
technical information of this program can be read on sourceforge: wicd
Installing wicd will remove the standard GNOME network manager, but it works like a charm on my machine.

Thursday, April 1, 2010

Space

Sometimes I refind my old hobby from my childhoodtime. Space. The web offers some very interesting sites about Space.

Here are som I found recently. Some are in Dutch of French, but the pictures are for everyone.

Mille milliards de mondes (Thousand billion worlds)
The Solar system
Alles over sterrenkunde (Everything about astronomy)
Sterrenkijker (Telescope)
Sterrenkunde in Nederland (Astronomy in the Netherlands)
Stellerium a computer planetarium for Linux, Mac and WindowsLink