changing the wired network profile, doesn't work

I'm not sure it is liked with plasma widget, as under karmic, I have no network widget anymore , but a network applet in the system tray... ??

The naming is a little confusing, but the system tray knetworkmanager applet comes from the same source package.

Same thing. Plasma-widget-networkmanagement doesn't work with fixed ip-add. on my hp550 with kubuntu karmic.
My configuration:
SSID: default
Mode: Ad hoc or Infrastructure
BSSID:
Interface: eth2
MTU: Automatic
Security: None
Configure: Manual
IP-address: 192.168.1.100
Subnetwork mask: 255.255.255.0
Gateway: 192.168.1.1
Search domians:
DNS-servers: 208.67.222.222, 208.67.220.220

What seems to happen, is that the widget does not route through the gateway:
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 2 0 0 eth2
link-local * 255.255.0.0 U 1000 0 0 eth2
root@l# host dk-hostmaster.dk
;; connection timed out; no servers could be reached
root@lap# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=127 time=7.41 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=127 time=2.54 ms
root@lap# route add default gw 192.168.1.1
root@lap# host dk-hostmaster.dk
dk-hostmaster.dk has address 193.163.102.23
dk-hostmaster.dk mail is handled by 10 vocal.dk-hostmaster.dk.

If I restart the connection, the gateway route is lost again, but immediately re-established by:
root@lap# route add default gw 192.168.1.1

If I set Configure: Automatic (dhcp), everything works fine, and it routes throgh the gateway.

Conclusion, the bug is that manual fixing addresses etc does not establish a routing through the gateway.

Incidentally, when I select automatic DHCP addresses only in the manage connection window wireless-tap, and I insert opendns ip-addresser, dns does not work either. The ip-addresses do not turn up in /etc/resolv.conf.

This and a number of other bugs in (kde) networkmanager are so serious for everyday practical use. I know at least 5-6 programmers who just laugh of nm because it so hopelessly buggy. They won't ever bother about writing bug reports because this is too far out. They just use other programs such as wicd. As I have written in another bug-report, it doesn't work for HUAWEI modem either. But, since I made a simple script for wvdial, it works EVERY time. Calling the importance of these bugs "low" is just out of proportions. It is so critical that even clever programmers avoid using the program on their laptops.

I hope the developers soon will fix these absolutely critical bugs and test networkmanager properly.

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner. There have been many changes in Ubuntu since that time you reported the bug and your problem may have been fixed with some of the updates. It would help us a lot if you could test it on a currently supported Ubuntu version. When you test it and it is still an issue, kindly upload the updated logs by running apport-collect 443235 and any other logs that are relevant for this particular issue.