Cannot change repositories using Debian ISO

First off: I am a Linux newbie when it comes to the CLI and its inner workings.

I executed a clean install of the LinuxCNC 2.6 Debian hybrid ISO and noticed that I cannot enable any of the other software repositories (non-free, etc) from Synaptic or the update manager. I can click the box, but the check-mark does not stay. Very odd.

Has anyone else had this happen with the Debian Wheezy that comes in the hybrid ISO?

Thanks,

Can only assume that whatever is in there is not correct?

I never use synaptic for that kind of thing.
Go to /etc/apt/ and rename sources.list to sources.list.old

Then put the attached in its place
(or if that is problematic, cut and paste the below into your existing file and comment ## out the previous lines)

Contains
which are all the main ones for US locations

Afterwards run sudo apt-get update to update the available files lists

regards

looks to me your not logged in as root , when using the package manager , have you created a user or using a user without the correct rights

change <your username > to reflect your setup

from a terminal
su -c "adduser <your username> sudo"
then logout and log back in again

@cncbasher

I got an authentication error when I tried running the su command. Not sure what to make of that.

When I executed "sudo adduser <my username> sudo" in terminal, it replied back that my username is already a member of sudo.

@ArcEye

From some of the reading I've been doing on Debian Wheezy this is a known issue with Synaptic for a lot of people (maybe everyone?). Apparently it's best to edit the sources.list and work through CLI, avoiding Synaptic.

Right now the only repository I have access to is "Source Code." The other ones (Main, Contrib, Non-Free) are "un-checkmarkable." If I only need Source Code then that's fine; this computer is intended to be a CNC control computer only. If I need the other repositories, then I'll have to work through CLI and edit sources.list.

Thank you all for the replies!