sudo apt-get install -f 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
  firefox
Suggested packages:
  firefox-gnome-support latex-xft-fonts firefox-libthai
The following NEW packages will be installed:
  firefox
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
Need to get 9229kB of archives.
After unpacking 29.3MB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://security.ubuntu.com feisty-security/main firefox 2.0.0.4+1-0ubuntu1 [9229kB]
90% [1 firefox 8372016/9229kB 90%]                                                84.0kB/s 10s^Fetched 9229kB in 1m41s (90.7kB/s)                                                            
(Reading database ... 124072 files and directories currently installed.)
Unpacking firefox (from .../firefox_2.0.0.4+1-0ubuntu1_i386.deb) ...
Replaced by files in installed package libnss3 ...
dpkg: error processing /var/cache/apt/archives/firefox_2.0.0.4+1-0ubuntu1_i386.deb (--unpack):
 unable to create `./usr/lib/firefox/firefox': No such file or directory
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/firefox_2.0.0.4+1-0ubuntu1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)