I recently upgraded from Ubuntu 9.4 to 9.10. Under 9.4, I had absolutely no problems connecting to our wireless network at home, and from there, going anywhere I liked. After the upgrade to 9.10, I can not go anywhere on-line, unless I first connect to my workplace VPN. Even then, getting to the sites I need to get to is not guaranteed. I constantly get an error message stating The server at www.<domain name> is taking too long to respond. I'm not exactly a Linux expert, so if anyone has a suggested solution, I'd be happy to try. I've made no changes to firewall or any other security measures.

What is your wireless hardware? Do 'lspci' in a terminal and find the entry for Wireless and post that. It is possible that you will need linux-backports-modules-wireless-karmic-generic.

Take a look at
https://help.ubuntu.com/community/Wi...eShootingGuide
For trouble shooting the connection.

Wireless hardware is a standard D-Link Wirless Networking card.

Here are the results of an 'lspci command':

duane@duane-desktop:~$ lspci
00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface (rev 02)
00:01.0 PCI bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE Host-to-AGP Bridge (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 82)
00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 02)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX/MX 400] (rev b2)
02:02.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 64)
02:03.0 Network controller: RaLink RT2561/RT61 rev B 802.11g
02:08.0 Ethernet controller: Intel Corporation 82801DB PRO/100 VE (LOM) Ethernet Controller (rev 82)
duane@duane-desktop:~$

https://bugs.launchpad.net/ubuntu/+s...ux/+bug/404596

It looks like the fix is in post #10 Be sure to read the links that the poster gives, too.