Wifi connects, then all Wifi stops

[corcaigher]

I just installed 18.04 64 bit on an NMVe SSD, all seemed to go well. However, I cannot maintain a wifi connection during or after the install. Within a minute of successfully connecting to my router, all wifi functions stop. I am unable to find any available wifi routers after this occurs.

I have two wifi network devices, an internal Netgear and an EDIMAX USB. The Netgear is where I am having this issue. The EDIMAX is not being recognized. I have the driver for the EDIMAX, but it of course requires make to compile, which is not installed by default, so cannot compile. I would appreciate any suggestions on how I might resolve this problem and get my new and super fast Kubuntu system up and screaming, with wifi fully functional.

[kc1di]

Do you know which netgear card you have?
is there any way to connect via Ethernet?

[corcaigher]

Not certain of model without shutting down and opening tower case, but here is the lspci output:
08:00.0 Network controller: Ralink corp. RT2790 Wireless 802.11n 1T/2R PCIe

In regards to ethernet connections, not accessible without moving entire desktop to another room.

[GreyGeek]

That's a pretty old chip and rather weak. Your problem may be that your link quality is below 40/70 because you are too far away from the router. Or, encryption is causing it to crash. The rt2800pci supports that chip.
Have you installed the firmware?
sudo apt update
sudo apt install firmware-ralink

I don't know if that firmware is in the repository but no harm in trying to install it.

You can turn off the encryption using:

sudo modprobe -rv rt2800pci
sudo modprobe -v rt2800pci nohwcrypt=Y

IF that helps or solves your problem then you can make it permanent by creating
/etc/modprobe.d/rt2800pci.conf
and in it putting:

options rt2800pci nohwncrypt=Y

and saving the file. It will be active on the next reboot.

[SpecialEd]

GG, is that nohwcrypt or nohwencrypt?

[GreyGeek]

parm: nohwcrypt: Disable hardware encryption. (bool)

[SpecialEd]

parm: nohwcrypt: Disable hardware encryption. (bool)

You've got it spelled both ways in the above post.

[corcaigher]

There is no internet connection to run an apt update.

[Snowhog]

Not certain of model without shutting down and opening tower case, but here is the lspci output:
08:00.0 Network controller: Ralink corp. RT2790 Wireless 802.11n 1T/2R PCIe

In regards to ethernet connections, not accessible without moving entire desktop to another room.

Well, without a stable WiFi connection, you might have no choice but to move your PC so you can connect via ethernet cable so updates can be completed and GreyGeek's suggestion in post #4 tried.

[vtpoet]

Just thought I'd throw this out there: Bluetooth is going through a full-blown meltdown right now. There's a known bug that affects not just Linux, but Apple and Windows as well:

https://bugs.launchpad.net/bugs/1721271

https://support.apple.com/en-gb/ht201542

https://superuser.com/questions/1230...h-interference

On the off-chance that this is the reason for your troubles (and if you have bluetooth), test your connection while disabling bluetooth.

[GreyGeek]

GG, is that nohwcrypt or nohwencrypt?

Thanks, Fixed it.
One can check for themselves by using the modinfo command:
modinfo rt2800pci