Cant launch software center and cannot get updates, gets error

Their is no help on the internet that i can see. so if anyone can help it would be appreciated

write this command in the terminal :
gedit /etc/apt/sources.list

copy all the file and paste it here

I suspect that you were following invalid and incorrect instructions from an old Ubuntu forum....

The current emulators that you can install using apt-get , aptitude, Ubuntu Software Center or Synaptic package manager using the standard "universe" repositories in Ubuntu 11.10, are listed here:

http://askubuntu.com/questions/87030/game-console-emulators-nintendo-super-nintendo-sega-genesis-nintendo-64-gam

When searching for packages in Ubuntu, only search using small letters. Package names in Ubuntu do not contain capital letters and Ubuntu (GNU/Linux in general) is case-sensitive.

First you will need to remove the invalid line (line 7) or lines in file /etc/apt/sources.list and save the change to undo the damage done.

Well im in the sources list and i cant find the right thing, and first command the first guy wrote didn't work

Ok i found the line and deleted it, but it wont let me save the changes i have done. it says i don't have permission here is the message i get
 You do not have the permissions necessary to save the file. Please check that you typed the location correctly and try again.
Here are whats in the list
# /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu/ oneiric main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ oneiric-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb http://download.tuxfamily.org/glxdock/repository/ubuntu oneiric cairo-dock
deb [url]http://packages.dfreer.org[/url] gutsy main
i get rid of the one specified in the error and i get what i said above

Thank god, thanks man. you saved my butt, i owe you one. but ya i fixed it and thanks for the link for the tutorial for sudo that helps to.

You're welcome. Don't forget to try out the emulators in the URL link I previously sent you. :-)

ok i will, do you know where i can get some bios for them

If I read correctly, I do not think you do not need to download a separate BIOS file for pcsxr (pcsx reloaded). But I have NOT tested pcsxr myself....

Read this:

http://answers.yahoo.com/question/index?qid=20110609132802AAkiOYs

More info here:

http://pcsxr.codeplex.com/discussions

Little mistake in my last message:

I meant to write the following:

If I read correctly, I do NOT think you NEED to download a separate BIOS file for pcsxr (pcsx reloaded). But I have NOT tested pcsxr myself....

pcsxr simulates the BIOS using internal programming instead

kk ill try that, ive been trying to figure out the regular pcsx with no luck. ill try the reloaded

Thanks Mark Rijckenberg, that solved my question.