Ralph, this is what I got from tcpdump:

s# sudo tcpdump -i eth0 -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
12:26:38.709492 IP 213.170.194.176.80 > 192.168.1.3.52683: R 
3870392194:3870392194(0) ack 2423321366 win 0
12:26:38.722132 IP 213.170.194.176.80 > 192.168.1.3.52684: R 
985327083:985327083(0) ack 3398403930 win 0
12:26:43.701759 arp who-has 192.168.1.3 tell 192.168.1.1
12:26:43.701832 arp reply 192.168.1.3 is-at 00:c0:df:e3:7e:4b
12:27:12.175823 IP 192.168.1.3.32824 > 192.168.1.1.53: 61781+ A? 
mail.troff.org. (32)
12:27:12.620649 IP 192.168.1.1.53 > 192.168.1.3.32824: 61781 2/2/2 CNAME 
troff.org., (145)
12:27:12.621417 IP 192.168.1.3 > 66.39.101.110: ICMP echo request, id 19483, 
seq 1, length 64
12:27:12.794212 IP 66.39.101.110 > 192.168.1.3: ICMP echo reply, id 19483, seq 
1, length 64
12:27:13.629662 IP 192.168.1.3 > 66.39.101.110: ICMP echo request, id 19483, 
seq 2, length 64
12:27:13.797589 IP 66.39.101.110 > 192.168.1.3: ICMP echo reply, id 19483, seq 
2, length 64
12:27:14.628646 IP 192.168.1.3 > 66.39.101.110: ICMP echo request, id 19483, 
seq 3, length 64
12:27:14.798151 IP 66.39.101.110 > 192.168.1.3: ICMP echo reply, id 19483, seq 
3, length 64

12 packets captured
12 packets received by filter
0 packets dropped by kernel


I think it worked fine. But hear this...
I changed the repositories, in order to download packages from 
www.canonical.com only and it worked.
I changed the server from MAIN to GREEK Server and Package Manager (PM) 
couldn't resolve the address gr.www.ubuntu.com.
Then I rolled back to MAIN Server. After that I CAN ping www.canonical.com AND 
www.ubuntu.com AND security.ubuntu.com.
After working with it for about an hour I downloaded updates normally from all 
repositories, although sometimes it freezes for a while and when I ping 
www.ubuntu.com it resolves to 1.0.0.0 again but only for a while.

My network is as simple as it gets, just a computer wired directly to my
ADSL Router. So I can't imagine where all that mess comes from...

-- 
Internet extremely slow in Gutsy after upgrade
https://bugs.launchpad.net/bugs/155393
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