andres@must:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  firefox-3.5 firefox-3.5-branding firefox-3.5-gnome-support firefox-3.5-kde libavcodec-extra-52 libavdevice-extra-52 libavfilter-extra-0 libavformat-extra-52 libpostproc-extra-51
  libswscale-extra-0 xulrunner-1.9.1 xulrunner-1.9.1-gnome-support xulrunner-1.9.1-kde
0 upgraded, 0 newly installed, 0 to remove and 13 not upgraded.


andres@must:~$ sudo apt-get install firefox-3.5
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  kmozillahelper gfxboot smbfs mozilla-esteid squashfs-tools libossp-uuid15 ffmpeg2theora xulrunner-1.9.1-kde mktemp
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  firefox-3.5-branding firefox-3.5-gnome-support
Recommended packages:
  ubufox
The following packages will be REMOVED
  estobuntu estobuntu-firefox firefox-3.5-kde
The following packages will be upgraded:
  firefox-3.5 firefox-3.5-branding firefox-3.5-gnome-support
3 upgraded, 0 newly installed, 3 to remove and 9 not upgraded.
Need to get 0B/1 190kB of archives.
After this operation, 410kB disk space will be freed.
Do you want to continue [Y/n]? n
Abort.
andres@must:~$

Fetched 4 607B in 3s (1 234B/s)
Reading package lists... Done
andres@must:~$ sudo apt-get install firefox-3.5
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  kmozillahelper gfxboot smbfs mozilla-esteid squashfs-tools liblqr-1-0 libossp-uuid15 ffmpeg2theora libphonon4 xulrunner-1.9.1-kde mktemp
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  firefox-3.5-branding firefox-3.5-gnome-support
Recommended packages:
  ubufox
The following packages will be REMOVED
  estobuntu estobuntu-firefox firefox-3.5-kde
The following packages will be upgraded:
  firefox-3.5 firefox-3.5-branding firefox-3.5-gnome-support
3 upgraded, 0 newly installed, 3 to remove and 15 not upgraded.
Need to get 1 192kB of archives.
After this operation, 410kB disk space will be freed.
Do you want to continue [Y/n]? n
Abort.

The following packages will be upgraded:
   firefox-3.5 (3.5.5+nobinonly-0ubuntu0.9.10.1+kde1 => 3.5.6+nobinonly-0ubuntu0.9.10.1+kde1)
   firefox-3.5-branding (3.5.5+nobinonly-0ubuntu0.9.10.1+kde1 => 3.5.6+nobinonly-0ubuntu0.9.10.1+kde1)
   firefox-3.5-gnome-support (3.5.5+nobinonly-0ubuntu0.9.10.1+kde1 => 3.5.6+nobinonly-0ubuntu0.9.10.1+kde1)
   firefox-3.5-kde (3.5.5+nobinonly-0ubuntu0.9.10.1+kde1 => 3.5.6+nobinonly-0ubuntu0.9.10.1+kde1)
   xulrunner-1.9.1 (1.9.1.5+nobinonly-0ubuntu0.9.10.1+kde2 => 1.9.1.6+nobinonly-0ubuntu0.9.10.1+kde2)
   xulrunner-1.9.1-gnome-support (1.9.1.5+nobinonly-0ubuntu0.9.10.1+kde2 => 1.9.1.6+nobinonly-0ubuntu0.9.10.1+kde2)
   xulrunner-1.9.1-kde (1.9.1.5+nobinonly-0ubuntu0.9.10.1+kde2 => 1.9.1.6+nobinonly-0ubuntu0.9.10.1+kde2)