Running ec-debianize ater a resh install

What does
uname -a
say?
If you did a plain update, it might have replaced the kernel and with it removed ethercat.
As a general rule for anyone reading this, never do a normal update on Linux used for machine control, use:
sudo apt-get update
sudo apt-get dist-upgrade

uname - returned ;
Linux debian 4.19.0-17-rt-amd64 #1 SMP PREEMPT RT Debian 4.19.194-2 (2021-06-21) x86_64 GNU/Linux

What does  report?
I did not use ethercatctl and instead used

Thats the reply from status :
modprobe: FATAL: Module ec_master not found in directory /lib/modules/4.19.0-17-rt-am

I would try
It seems something has changed in your setup as Tommy has said.
You may need to edit your config file again after above.

Thank you gentlemen, that worked .
One comment though . linux-headers-rt-amd64 didn't seem to do the trick .
But the message from: sudo apt install ethercat-dkms libethercat libethercat-dev ethercat-master requested :
linux-headers-4.19.0-17-rt-amd64
Installing that fixed it .
Cheers

Great, I think we can use uname -r in the command to install the headers somehow to make it more generic
I did notice I had troubles with headers where I pulled the linuxcnc repo from unstable into bullseye at this point too which is kinda why I went to unstable. etherlabmaster was looking in the wrong kernel folder... same as you....

EDIT: It gets messed up when there is more than one kernel on the system

Yes Does the trick

rodw wrote:

Yes

Code:

sudo apt install linux-headers-$(uname -r) Does the trick

That is a very neat way of doing it, not the brute force i use with google and "" !

Thanks Tommy. I saw it done somewhere but it took a while to remember how...
But it certainly completed the command correctly