I have installed Xubuntu 13.10 amd64 on ThinkPad T400 for my neighbour and converted his laptop from Windows to Linux.

It was about 24hours later, he told me that he can't login to his desktop anymore. He got the Splash Screen where there is Xubuntu Logo and the circle spinning and that is all. I tried with him some steps but we both agreed that he come over to drop his laptop so I can have a better look.

I am not sure what exactly he has done but he said he tried to install dropbox and iTunes and it seems he managed to install dropbox but of course couldn't install iTunes from their website.

Anyway, any idea what should be done?