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After upgrading from 13.04 to 13.10, I was having the problems described in this bug (ie couldn't mount a USB/CDROM and couldn't use GUI shutdown button)

So I tried the solution given in post #49, which was: "The easiest fix is to switch to GDM Run these commands: sudo apt-get remove lightdm sudo apt-get install gdm Then reboot."

I did this and now Ubuntu won't load! Just hangs on a purple screen with the Ubuntu logo.

Please could someone help?! I am worried that I'll lose all my files!

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returned to previous state by reversing what I did, ie:

sudo apt-get remove gdm sudo apt-get install lightdm

However I am still unable to mount a USB/CDROM or use the GUI shutdown button.

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