can you log in as root?
then type the following into a terminal
# chmod 777 /tmp

if you can't log in as root (because for instance no root password is set),
i suggest  booting into single user/recovery mode
you'll then get a root prompt where you'll be able to change the permissions

if you don't have single user grub entry, edit the existing grub entry by 
typing 'e'
and add 'single' tot the line with the kernel and boot with 'b'

-- 
There is a problem with the configuration server. 
(/usr/lib/libgconf2-4/gconf-sanity-check-2 exited with status 256)
https://bugs.launchpad.net/bugs/269215
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