@lucier: those packages where probably automatically installed and are now considered unused by aptitude and automatically removed. Only you know if they are still useful on your system.
If you don't want to remove the automatically installed packages, you can use 'apt-get install' instead of aptitude which will suggest to remove them or with aptitude enter ':~M' (without the quotes which means "keep the packages at the current state when the state is 'automatically installed'") at the confirmation prompt.
@lucier: those packages where probably automatically installed and are now considered unused by aptitude and automatically removed. Only you know if they are still useful on your system.
If you don't want to remove the automatically installed packages, you can use 'apt-get install' instead of aptitude which will suggest to remove them or with aptitude enter ':~M' (without the quotes which means "keep the packages at the current state when the state is 'automatically installed'") at the confirmation prompt.