The following packages were automatically installed and are no longer required [duplicate]

After a fresh install of Ubuntu 12.04.1 (64bit), I get the following message when I want to install software via terminal:

The following packages were automatically installed and are no longer required:
linux-headers-3.2.0-29 linux-headers-3.2.0-29-generic

Is this normal? As it's related to the Linux core itself, I am confused that it might break my system.

yes this message is normal it seems that you have updated your kernel before and these headers are no longer needed anyway before you make sudo apt-get autoremove you can test your kernel version by typing uname -r if the version is greater that 3.2.0-29 so you can do the autoremove and this wouldn't affect your system