New answers tagged interface
In Ubuntu 14.04, it is in the /etc/NetworkManager/NetworkManager.conf. But you may need to deal with the permissions.
You can remove the gimp logo from the toolbox by adding this line to the gimprc file in ~/.gimp2.8 (toolbox-wilber no) You should be able to add it using this command echo "(toolbox-wilber no)" >> ~/.gimp-2.8/gimprc or this (which seems to work...), if you are using a version other than 2.8: echo "(toolbox-wilber no)" >> ~/.gimp*/gimprc ...
short answer: re-install Ubuntu from a Live CD or USB. long version: would be a waste of your time. your system will never be clean. but if you insist you could try copying everything (missing) but the /home folder from the Live CD/USB to your hdd. OR do an re-install/repair over the broken system again with the Live CD/USB. OR download the deb file for ...
What do you mean by interface? For most people the command line (over SSH if remote access is required) is plenty. Xubuntu is made up of all the same packages as Ubuntu (as is Ubuntu Server). Anything you can do in one of them (eg sudo apt-get install lamp-server^) will work in the other.
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