since up-grading to 11.10 wifi keeps dropping out

Please let me know your wifi card type or output of "lspci" command..

Hi Lalatendu Mohanty, here are the results of lspci.

peter@peter-HP-Mini-110-3700:~$ lspci
00:00.0 Host bridge: Intel Corporation N10 Family DMI Bridge (rev 02)
00:02.0 VGA compatible controller: Intel Corporation N10 Family Integrated Graphics Controller (rev 02)
00:02.1 Display controller: Intel Corporation N10 Family Integrated Graphics Controller (rev 02)
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 02)
00:1c.2 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 3 (rev 02)
00:1c.3 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 4 (rev 02)
00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation NM10 Family LPC Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation N10/ICH7 Family SATA AHCI Controller (rev 02)
00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 02)
01:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 05)
peter@peter-HP-Mini-110-3700:~$

Thank you for your assistance, I,m hoping what I have provided is correct.

As I guessed you have Broadcom wifi card.

See if this helps. This should work

$ sudo apt-get update
$ sudo apt-get install firmware-b43-installer
$ sudo apt-get remove bcmwl-kernel-source
$ sudo reboot

http://nfolamp.wordpress.com/2011/10/15/ubuntu-11-10-getting-wireless-bcm4311-working/

If the above does not work, try below commands and check if ur wifi card is disabled (i mean locked by OS)

rfkill list

rfkill unblock all

http://askubuntu.com/questions/9816/wireless-shows-up-as-disabled-how-can-i-get-it-working

I ran all 4 sudo commands and nothing is better. It connects to the wifi and about 15 seconds later it disconnects. 5 to 10 seconds it connects again and then disconnects, etc.
I also run rfkill list and it said "no" to all, but I ran rfkill unblock all, just in case. nothing changed. It works fine via the ethernet cable, but thats not the point of using a laptop.
thanks, Peter.

Thanks for the link, but I'm a little confused. There seems to be a
number of different solutions to the same or similar problem. As I'm a
bit of a novice, to say the least, can you advise me on what solution
I should try first. Please detail it in a clear step by step list,
thank you. One good thing that comes from problems is that I'm
learning from them.
Regards Peter.

On 08/11/2011, Lalatendu Mohanty <email address hidden> wrote:
> Your question #177711 on gnome-nettool in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/gnome-nettool/+question/177711
>
> Status: Open => Answered
>
> Lalatendu Mohanty proposed the following answer:
> Your card is "BCM4313 802.11b/g/n ". The last solution was for BCM4311.
> Sorry! . Please go through the below link and see if it helps
>
> http://ubuntuforums.org/showthread.php?p=10057878
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
> https://answers.launchpad.net/ubuntu/+source/gnome-nettool/+question/177711/+confirm?answer_id=4
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+source/gnome-nettool/+question/177711
>
> You received this question notification because you asked the question.
>

I understand your problem. Sorry I don't have exact steps as I haven't used a BCM 4313 wifi card. I have a 3411 card in my laptop.

Thanks Lalatendu Mohanty, from your link I ran the following
"apt-cache search bcmwl", "bcmwl-modaliases" and "bcmwl-modaliases",
from "Bodsda". Now going by the responses it gave me, I believe I have
done nothing. Also "Bodsda" says to then "After installing the kernel
source, give it a reboot", which I did not do, as I do not know how to
install the kernel. But I am actually replying via wifi, so something
has changed and so far so good.
Thanks a lot, Peter.

On 09/11/2011, Lalatendu Mohanty <email address hidden> wrote:
> Your question #177711 on gnome-nettool in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/gnome-nettool/+question/177711
>
> Lalatendu Mohanty posted a new comment:
> I understand your problem. Sorry I don't have exact steps as I haven't
> used a BCM 4313 wifi card. I have a 3411 card in my laptop.
>
> --
> You received this question notification because you asked the question.
>

Thanks Lalatendu Mohanty, from your link I ran the following
"apt-cache search bcmwl", "bcmwl-modaliases" and "bcmwl-modaliases",
from "Bodsda". Now going by the responses it gave me, I believe I have
done nothing. Also "Bodsda" says to then "After installing the kernel
source, give it a reboot", which I did not do, as I do not know how to
install the kernel. But I am actually replying via wifi, so something
has changed andat this stage, so far so good.

Thanks Lalatendu Mohanty, that solved my question.