Thank you knudfl!
My Android OS has no and issue with fedora 12 because the reason is l am discuss with u by my Android phone.
The text u sent is exactly the same with the previous post. Or I don't got the difference. My repomd.xml file is located with the following path
/etc/yum/pluginconf.d/ does it has a problem? I mean where it have to located?
Best regards!

Re #16.

1) My question was : Why don't you use Fedora 12 to write your above posts ?
2) Are you behind a firewall ? Or does something else prevent yum to work ?
... Please disable SELinux : Must be done anyway. Else no NCTUns function.
https://en.wikipedia.org/wiki/Security-Enhanced_Linux


? Which path ?

Not relevant.


Please replace your repo file with the one attached to post #15.
( The post #2 attachment was 494B . The new one is 297B : Read post 15 ! )


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Okay thanks again knudfl! I replaced but nothing is changed. And how do I disable SElinux ?
Best regards!

Knudfl for your information I removed every file in yum.repos.d and only kept the second repo file you sent to me, is it okay?

The full error mesaage is as follows
Loaded plugins: presto, refresh-packagekit
Http://archives.frdoraproject.org/pu...ta/repomd.xml: (Errno 14) pycurl Error 6 - ""
Trying other mirror.
Error:cannot retrieve repository metadata(repomd.xml) for repository fc12-updates. Please verify its path and try again

Re #18.

Please read all your Menu entries. It's essential to known a little bit about your OS.
https://docs.fedoraproject.org/en-US...uide-en-US.pdf


MENU : System > Administration >> SELinux


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Re #20.

Please replace your file in /etc/yum/repos.d with the one attached to post #15.

! ! Your current link for update has a typo :
"http://archives.frdoraproject.org/pub/archive/fedora/linux/updates/12/i386/repodata"

I.e. it is fedora, not frdora.

Wonder where you got that faulty text ....


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Sorry Knudfl. It was a typing error.
Let me read the pdf dicument of fedora and we will meet again.

Hi Knudfl how u? I tried to read the Fedora 12 manual but I was expecting that common error fixation mechanisms and repairing and.... but nothing is included there. Some how I know some useful things, thank u for that. I am reinstall the OS and I will ask if the problem is happen again.

Hello Knudfl. Thank you very much for your help!
Finally the problem is solved. The problem were an internet connection to download and install missing files. So I followed the ff steps and it works
1) comment all mirrors and uncomment all baseurl but change the site of the url to http://archives. Fedoraproject.org...
2) run the command yum groupinstall "development libraries" "development tools" "legacy software development" then it will download as well as upgrade automatically.
3) yum install mkinitrd -p Xterm
Then it finishes all the necessary steps, after this we can install NCTUNS with out any problem. But before all of the above steps there have to be a very good internet connection. And we have to set the settings of Virtualbox to connect to internet with out a problem.

The other thing is I need the source code of Freeway mobility model and tutorials about simulating with NCTUNS -6.0. If u have any information pls share to me.

Re #25.

Freeway mobility model : Please see bonnmotion for "mobility models"
http://sys.cs.uos.de/bonnmotion/

NCTUns tutorials https://www.google.com/webhp?hl=all&...TUns+tutorials


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Hello every one! I am simulating my networking thesis by using NCTUns which is installed on fedora 12 and the fedora 12 operating system is installed on virtualbox. Due to it denied me to use a full screen mode. I want to install guest additions from internet but the "view" and "Device" menus are not shown so what can I do to view this menus and pls sugget me to install guest additions using terminal command.

Hello again how u all? My oracle virtualbox can't support a full screen. But it is very important to me. Is there any one who can help me? How can I make it to support a full screen? I need for education purpose.