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Wireless on ubuntu no longer connecting to network


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#1 dev00790

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Posted 07 March 2015 - 04:48 PM

Hello,

For months before yesterday I was able to connect to the home router (usual SSID name) and same wireless password. Then the wifi could no longer connect, and started timing out. I checked the router, did hard reset on it, and still was unable to connect to it. I suspect the wireless card or software may have been remotely tampered with.

I cannot use Windows to troubleshoot since there is no longer wireless driver avail on Manufacturers website.

OS is Ubuntu 14.01 booting on dvd. Another original ubuntu disc also gives same problem - pointing to hardware issue to me.

Please advise troubleshooting steps for this issue.

Regards, dev00790

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#2 paul88ks

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Posted 07 March 2015 - 05:59 PM

If it was just Windows not connecting,I would say you might have a virus,but since Ubuntu won't connect either , sounds like your wireless adapter- you might try an inexpensive usb wireless adapter and see if that works.If it doesn't,you can always take it back!



#3 NickAu

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Posted 07 March 2015 - 06:57 PM

Have you looked in BIOS? The wifi may be disabled there. If it is not working with Windows and Linux then the wireless adapter is, 1 Turned off , or, 2 No good any more.

 

 

you might try an inexpensive usb wireless adapter and see if that works

+1


Edited by NickAu, 10 March 2015 - 01:49 AM.


#4 Guest_hollowface_*

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Posted 07 March 2015 - 11:29 PM

The only thing that comes to my mind is that perhaps someone living near you has setup a network on the same channel and it's disrupting yours? If that's the case then configuring your router to broadcast on a different channel may help. The exact steps will depend on your router, but it should be as simple as choosing from a selection of supported channels, and saving your changes.



#5 dev00790

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Posted 08 March 2015 - 08:38 AM

Hi I took out and put back in the cmos battery to reset the bios to default settings. Wifi worked after this. Wifi was enabled in Bios before & after removal of battery. Hence I believe an adversary had a sophisticated uncommon bios rootkit on laptop. There have been proof pf concept bios rootkits before. I may be looking at an APT.

Regards, dev00790

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#6 NickAu

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Posted 08 March 2015 - 03:34 PM

 

Hence I believe an adversary had a sophisticated uncommon bios rootkit on laptop

As there is a question about a rootkit, I will ask somebody for advice.


Edited by NickAu, 09 March 2015 - 10:59 PM.


#7 cat1092

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Posted 09 March 2015 - 11:41 PM

 

 

Hi I took out and put back in the cmos battery to reset the bios to default settings. Wifi worked after this.

 

The same old trick that has saved the day for untold millions of computer users worldwide to fix a range of issues. It's among the first of things that I do, if the PC isn't acting right for whatever reason, be it a Linux or Windows install. While I don't know the mechanism of how the BIOS works, other than it's needed for the operation of the computer, I do know that clearing things by power down & safe removal of the battery, which includes removing other power sources, such as an Ethernet cable & being sure to press & hold the Power button for at least 30 seconds to purge excess electricity. This is a great time to change the battery, if more than 5 years old. Commonly used CR2032 batteries are sold in two packs for less than $5 at Walmart & other mass discount retailers. 

 

When I'm saying this, am referring to non-UEFI enabled motherboards, with one of those, especially if from OEM & Secure Boot was enabled at the factory before shipping, it's important to know how to get back to the point of where one was, if Secure Boot was disabled (this describes me) after the purchase. Fortunately, have yet to need to perform this action on this computer, and hope it's a long time before I do. However, I have printed instructions for 'just in case' this becomes needed. 

 

This also resets things like auto booting from USB devices when attached, or the optical drive, if that wasn't already at the top of the boot order. 

 

It's a sure enough long known 'fix it' solution for many issues, however it can create much work for those with UEFI based MB's afterwards, so these users must be sure they'll benefit before performing the operation. 

 

 

 

There have been proof pf concept bios rootkits before.

 

Not being a Malware specialist, cannot answer this one. 

 

Cat


Performing full disc images weekly and keeping important data off of the 'C' drive as generated can be the best defence against Malware/Ransomware attacks, as well as a wide range of other issues. 





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