alum:~# apt-get remove firefox
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package firefox is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
alum:~# apt-get install iceweasel
Reading package lists... Done
Building dependency tree
Reading state information... Done
iceweasel is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
alum:~# apt-get --reinstall install iceweasel
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reinstallation of iceweasel is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.