New install - WiFi connection keeps on restarting

[binro]

I recently installed a system backed up from my desktop onto a laptop. The only significant difference is that the desktop was wired to the router and the laptop is using WiFi. I use NetworkManager and everything starts up as normal, it seems as soon as I do something like ssh to another system, the connection restarts:

[NeddySeagoon]

binro,
reason=3 means that the WiFi was told to disconnect.
The usual cause is that several things are trying to control it.
You may have at most, one, or they fight but none can win.

The usual approach is to disable all candidates that can start WiFi and prove it by rebooting.
Notice that WiFi does not start. That's a good sign.
Now add back exactly one service and reboot.
You should be good.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

[binro]

Neddy, thanks for the suggestion but AFAICT, there is only NM trying to start the connection. Looking at the KDE Settings network tab, apart from the active WiFi there are only connections active some weeks ago. \Were do I look for "candidates"?
_________________
"Ship me somewheres east of Suez, where the best is like the worst,
Where there ain't no Ten Commandments an' a man can raise a thirst"
from "Mandalay" by Rudyard Kipling

[NeddySeagoon]

Disable NetworkManager and reboot.
If WiFi works now, it's NetworkManager and something else fighting.
If it keeps cycling with reason=3, youhave several sometings still.
Both dhcpcd and wpa-supplicant can start WiFi too.
To use NetworkManager, neither must be started as a service. NetworkManager will take care of it.

The first step is to make WiFi not start at all.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

[binro]

I removed NM from the service start lists and rapidly discovered you must remove dependent services (netmount, sendmail, etc...), After rebooting there was no network connection. I started NM and the WiFi connected, so I left it for a long time and nothing bad happened. I then ssh'ed into another system and immediately the connection restarted. I had copied ~/.ssh from the desktop system and the public keys had the old host name after the Base64 key text, but that is just for humans, isn't it? Anyway the laptop is for the g/f and she won't be doing any shelling about, so I guess I can live with the weirdness!

Thanks anyway.
_________________
"Ship me somewheres east of Suez, where the best is like the worst,
Where there ain't no Ten Commandments an' a man can raise a thirst"
from "Mandalay" by Rudyard Kipling

[NeddySeagoon]

binro,

I't a very bad thing to copy the host keys from one system to another.
As you say, the plaintext is just for humans. The key is for ssh to identify the host its connecting to.r
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.