root@ubuntu-server:~# aptitude upgrade
The following packages will be REMOVED:
  linux-headers-3.2.0-32{u} linux-headers-3.2.0-32-generic{u} linux-headers-3.2.0-33{u} linux-headers-3.2.0-33-generic{u}
0 packages upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 135 MB will be freed.
Do you want to continue? [Y/n/?]