the problem is being addressed upstream (see please 
http://bugzilla.kernel.org/show_bug.cgi?id=11721)
i use a Zyxel 642R, but maybe a few of outdated modem can cause this problem.
anyway, just today a workaround has been found (at least for me, please let us 
know if it works for you as well) try launching with sudo or as root the 
following command:
echo 0 > /proc/sys/net/ipv4/tcp_sack
and afterwards give a try to firefox to see if you can navigate internet.
should it work for you, this workaround will last until you shutdown or reboot.
in order to avoid to run that command anytime you start your system, you can 
write a file (give it whatever name you like) containing just this two lines:
#! /bin/bash
sysctl -w net.ipv4.tcp_sack="0"
and put it in /etc/network/if-pre-up.d (obviously you should cp or mv that file 
to that directory using either sudo or becoming root)

let me know
aldo

-- 
intrepid - after upgrade to kernel 2.6.27 i cannot upgrade nor i can navigate 
internet
https://bugs.launchpad.net/bugs/272896
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