Just to check your mirrors: run 'sudo apt-get update' run 'sudo apt-get -s upgrade | grep libc6'
If you get the following (note the 2.7-9ubuntu2) you should be good to go
libavcodec1d libavutil1d libc6 libcairo2 libcupsimage2 libcupsys2 libdb4.6 Inst libc6 [2.7-5ubuntu2] (2.7-9ubuntu2 Ubuntu:8.04/hardy) Conf libc6 (2.7-9ubuntu2 Ubuntu:8.04/hardy)
If you have 2.7-9ubuntu1 do not upgrade just yet :)
Just to check your mirrors:
run 'sudo apt-get update'
run 'sudo apt-get -s upgrade | grep libc6'
If you get the following (note the 2.7-9ubuntu2) you should be good to go
libavcodec1d libavutil1d libc6 libcairo2 libcupsimage2 libcupsys2 libdb4.6
Inst libc6 [2.7-5ubuntu2] (2.7-9ubuntu2 Ubuntu:8.04/hardy)
Conf libc6 (2.7-9ubuntu2 Ubuntu:8.04/hardy)
If you have 2.7-9ubuntu1 do not upgrade just yet :)