Running ec-debianize ater a resh install

open a terminal
sudo apt install geany curl
sudo geany /etc/apt/sources.list

 insert this line at the end of the file
deb [allow-insecure=yes] https://download.opensuse.org/repositories/home:/bone11111:/branches:/science:/EtherLab/Debian_10/ ./
Save and close geany
enter these two commands to create a security key
KEYRING=/usr/share/keyrings/ethercat.gpg
curl -fsSL https://download.opensuse.org/repositories/home:/bone11111:/branches:/science:/EtherLab/Debian_10/Release.key | gpg --dearmor | sudo tee "$KEYRING" >/dev/null
sudo apt update
sudo apt install -y linux-headers-rt-amd64 
sudo apt install ethercat-dkms libethercat libethercat-dev ethercat-master
ip a (and save MAC address of the NIC used for ethercat)
sudo geany /etc/ethercat.conf
set your Master0 device to your MAC address and device modules to generic
MASTER0_DEVICE="xx:aa:yy:zz:bb:cc"
DEVICE_MODULES="generic"
save and close geany
sudo systemctl enable ethercat.service
sudo systemctl start ethercat.service
sudo systemctl status ethercat.service
sudo chmod 666 /dev/EtherCAT0
Ethercat should be running. If the above command is not found, you have a problem
You can list the slaves if you type
ethercat slaves

 

mkdir dev
cd dev
git clone https://github.com/sittner/linuxcnc-ethercat.git
cd linuxcnc-ethercat/src
replace the contents of realtime.mk with the revisions on this forum thread
https://forum.linuxcnc.org/9-installing-linuxcnc/41983-linuxcnc-ethercat-undefined-symbol-ecrt-slave-config-sdo#203252

make clean
sudo make install

The following NEW packages will be installed:
  ethercat-dkms ethercat-master libethercat libethercat-dev
0 upgraded, 4 newly installed, 0 to remove and 269 not upgraded.
Need to get 19.3 kB/1,234 kB of archives.
After this operation, 70.2 MB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  ethercat-dkms libethercat ethercat-master libethercat-dev
Install these packages without verification? [y/N]