NEW Problem WITH UBUNTU STARTUP

[ashwin1711]

during to install libsynaptics0 gsynaptics, the root black screen givs
error msg and says 'Reading package lists...Done
Building dependency tree Reading state information...Done
The following New packages will be installed: gsynaptics libsynaptics0
0 upgraded, 2 newly installed, 0 to remove and 37 not upgraded.Need to
get 87.8kB of archives.After this operation, 590kB of additional disk
space will be used.
Err http://archive.ubuntu.com jaunty/universe gsynaptics 0.9.14-8
could not resolve 'archive.ubuntu.com'
Failed to fetch
http://archive.ubuntu.com/ubuntu/pool/universe/g/gsynaptics/gsynaptics_0.9.14-8_i386.deb
could not resolve 'archive.ubuntu.com'
Failed to fetch
http://archive.ubuntu.com/ubuntu/pool/universe/libs/libsynaptics/libsynaptics0_0.14.6c-2_i386.deb
could not resolve 'archive.ubuntu.com'
E: Unable to fetch some archives, maybe run apt-get update or try with
--fix-mis sing?'
so now what should i do? please help me

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ASHWIN JANGAM