partial upgrade problem

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http://askubuntu.com – does anyone know in ubuntu 12.04 x64 bit what does this repository do "http://ubuntu.mirror.cambrium.nl/ubuntu/" exactly? when I unchecked it in the software sources second tab I wouldn't get the partial upgrade error also can update packages as usual but cannot install some packages! for example the ia32-libs which is required for some softwares like teamviewer or skype and when I checked it I get partial upgrade error and cannot update system as usual because it corrupts my other packages... I am totally confused please somebody give me a solution! (HowTos)