when you have a prompt you can check the pemissions with:
# ls -l /

you'll then see something like:

drwxr-xr-x ....... /tmp

there are three sets of permissions, first the owner of the file/directory then 
the group then everyone else.
if everyone can write it will read:

drwxrwxrwx .../tmp

you can change permissions with chmod using either letters for the
permissions or a numeric code

7 means read, write and execute, 777 means everyone can rwx

doing
# chmod 777 /tmp 
should do the trick

-- 
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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