@FRR149 

Is the Deco is getting an IPv4 address, have you tried utilizing IPv4 for the Linux machine?

@Tony 

Confirmed. IPV6 was disabled on the deco. I also disabled it on the Linux laptop. Still no luck... :-(

@Tony 

BTW, this is the log from sudo journalctl -b 0 /usr/sbin/NetworkManager 
 

sep 25 11:49:52 winston-wolfe NetworkManager[1289]: <info>  [1601027392.4189] device (wlo1): supplicant interface state: associating -> associated
sep 25 11:49:52 winston-wolfe NetworkManager[1289]: <info>  [1601027392.4189] device (p2p-dev-wlo1): supplicant management interface state: associating -> associated
sep 25 11:49:52 winston-wolfe NetworkManager[1289]: <info>  [1601027392.4318] device (wlo1): supplicant interface state: associated -> 4-way handshake
sep 25 11:49:52 winston-wolfe NetworkManager[1289]: <info>  [1601027392.4318] device (p2p-dev-wlo1): supplicant management interface state: associated -> 4-way handshake
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <warn>  [1601027396.5121] sup-iface[0x563245dc7210,wlo1]: connection disconnected (reason 2)
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.5172] device (wlo1): supplicant interface state: 4-way handshake -> disconnected
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.5176] device (wlo1): Activation: (wifi) disconnected during association, asking for new key
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.5177] device (wlo1): state change: config -> need-auth (reason 'supplicant-disconnect', sys-iface-state: 'managed')
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.5181] device (p2p-dev-wlo1): supplicant management interface state: 4-way handshake -> disconnected
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.6173] device (wlo1): supplicant interface state: disconnected -> scanning
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.6173] device (p2p-dev-wlo1): supplicant management interface state: disconnected -> scanning
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.7215] device (wlo1): supplicant interface state: scanning -> inactive
sep 25 11:49:56 winston-wolfe NetworkManager[1289]: <info>  [1601027396.7215] device (p2p-dev-wlo1): supplicant management interface state: scanning -> inactive
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.7926] device (wlo1): state change: need-auth -> deactivating (reason 'new-activation', sys-iface-state: 'managed')
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.7931] manager: NetworkManager state is now CONNECTED_LOCAL
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.7943] device (wlo1): disconnecting for new activation request.
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.7944] audit: op="connection-activate" uuid="6df5bc60-2d2b-49d8-824b-79712bcf2c44" name="codenet" pid=2468 uid=1000 result="success"
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <warn>  [1601027397.7996] device (wlo1): Deactivation failed: GDBus.Error:fi.w1.wpa_supplicant1.NotConnected: This interface is not connected
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.7996] device (wlo1): state change: deactivating -> disconnected (reason 'new-activation', sys-iface-state: 'managed')
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8005] device (wlo1): Activation: starting connection 'codenet' (6df5bc60-2d2b-49d8-824b-79712bcf2c44)
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8013] device (wlo1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8016] manager: NetworkManager state is now CONNECTING
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8019] device (wlo1): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8039] device (wlo1): Activation: (wifi) access point 'codenet' has security, but secrets are required.
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8039] device (wlo1): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8041] sup-iface[0x563245dc7210,wlo1]: wps: type pbc start...
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8063] device (wlo1): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8066] device (wlo1): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8069] device (wlo1): Activation: (wifi) connection 'codenet' has security, and secrets exist.  No new secrets needed.
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8069] Config: added 'ssid' value 'codenet'
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8069] Config: added 'scan_ssid' value '1'
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8069] Config: added 'bgscan' value 'simple:30:-65:300'
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8069] Config: added 'key_mgmt' value 'WPA-PSK WPA-PSK-SHA256 FT-PSK'
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.8070] Config: added 'psk' value '<hidden>'
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.9236] device (wlo1): supplicant interface state: inactive -> authenticating
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.9236] device (p2p-dev-wlo1): supplicant management interface state: inactive -> authenticating
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.9679] device (wlo1): supplicant interface state: authenticating -> associating
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.9679] device (p2p-dev-wlo1): supplicant management interface state: authenticating -> associating
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.9837] device (wlo1): supplicant interface state: associating -> associated
sep 25 11:49:57 winston-wolfe NetworkManager[1289]: <info>  [1601027397.9838] device (p2p-dev-wlo1): supplicant management interface state: associating -> associated
sep 25 11:49:58 winston-wolfe NetworkManager[1289]: <info>  [1601027398.0208] device (wlo1): supplicant interface state: associated -> 4-way handshake
sep 25 11:49:58 winston-wolfe NetworkManager[1289]: <info>  [1601027398.0209] device (p2p-dev-wlo1): supplicant management interface state: associated -> 4-way handshake
sep 25 11:50:02 winston-wolfe NetworkManager[1289]: <warn>  [1601027402.1023] sup-iface[0x563245dc7210,wlo1]: connection disconnected (reason 2)
sep 25 11:50:02 winston-wolfe NetworkManager[1289]: <info>  [1601027402.1074] device (wlo1): supplicant interface state: 4-way handshake -> disconnected
sep 25 11:50:02 winston-wolfe NetworkManager[1289]: <info>  [1601027402.1079] device (wlo1): Activation: (wifi) disconnected during association, asking for new key
sep 25 11:50:02 winston-wolfe NetworkManager[1289]: <info>  [1601027402.1079] device (wlo1): state change: config -> need-auth (reason 'supplicant-disconnect', sys-iface-state: 'managed')

@Tony Hi any news on this? Is the deco defective and should I return it to amazon?

FRR149 wrote

Since yesterday, my laptop with Ubuntu 20.04 can't access the regular wifi created by the deco. It tries to connect, asks for the password, drops the connection and starts all over again. This happens every 5 seconds, it's ubelievable.

If I connect to the guest network (without a password) or another wifi by a Netgear router, everything works fine. It seems it's the authentication that suddenly stopped working. Both the laptop and Deco are up to date.

 

The wifi is configured on linux for WPA & WPA2 Personal and automatic IPV6

 

Any help would be greatly appreciated!

@FRR149 

What you could try is to download the M4 beta firmware that will allow you to change the wireless security to WPA2 AES (link), and test that connection. If the connection issue still persists, I would reach out to your local TP-Link support team at that point.

Found the solution for Ubuntu 20.04 with DECO M5 Mesh on Ethernet Backhaul (Deco with up to date firmware)

I found the trail to the problem on this post:
https://www.raspberrypi.org/forums/viewtopic.php?t=251640

Without looking for the network foundations, I changed the timeout parameter in my Ubuntu 20.04 /etc/dhcp/dhclient.conf

Changed parameter timeout from 300 (5 minutes) to 30000 (500 minutes, 8.33 hours).

Now WIFI changes signal strength, is connected to a weaker AP, but stays connected.